{"id":1724,"date":"2026-07-01T13:40:01","date_gmt":"2026-07-01T13:40:01","guid":{"rendered":"https:\/\/www.arysontechnologies.com\/how-to\/?p=1724"},"modified":"2026-07-01T13:40:02","modified_gmt":"2026-07-01T13:40:02","slug":"migrate-imap-emails-to-office-365-account","status":"publish","type":"post","link":"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/","title":{"rendered":"Migrate 1000 Mailboxes from IMAP to Office 365 for IT Admins"},"content":{"rendered":"<div class=\"query\" style=\"background-color: #f7fff9; padding: 20px; \/* border-left: 3px solid #265378; *\/margin-bottom: 10px; border: 2px solid #00e477; border-radius: 19px;\">\r\n<p><em><strong>Query: <span style=\"font-weight: 400;\">Our company is switching from a hosted IMAP server to Office 365, and we have over 1,000 user mailboxes to migrate. Every time IT attempts the manual CSV-based IMAP migration through the Exchange Admin Center, it stops halfway through. How do we migrate all mailboxes, with attachments and folder structure intact, without restarting the process from scratch each time?<\/span><\/strong><\/em><\/p>\r\n<\/div>\r\n<div class=\"query\" style=\"background-color: #effaff; padding: 20px; border-left: 4px solid #265378; margin-bottom: 10px; border-radius: 20px; border-right: 4px solid #265378; box-shadow: rgba(60, 64, 67, 0.3) 0px 1px 2px 0px, rgba(60, 64, 67, 0.15) 0px 2px 6px 2px; \/* border-image: linear-gradient(to bottom, #62D593, rgba(0, 0, 0, 0)) 1 100%;\">\r\n<p><em><strong>Summary: <span style=\"font-weight: 400;\">Microsoft&#8217;s built-in IMAP migration moves email, nothing else. Contacts, calendars, tasks, and notes get missed entirely. Folder mapping breaks too, particularly with GoDaddy, cPanel hosts, and non-standard IMAP providers where folder structures don&#8217;t align properly with Exchange Online. Eventually, the IT teams need to fix the mismatched folders manually or look for ways to migrate 1000 mailboxes from IMAP to Office 365. For a proper migration, the <\/span><a href=\"https:\/\/www.arysontechnologies.com\/imap-backup\/\" target=\"_blank\" rel=\"noopener\">Aryson IMAP Backup Tool<\/a><span style=\"font-weight: 400;\"> handles the complete migration with the least post-migration work to do. <\/span><\/strong><\/em><\/p>\r\n<div class=\"row justify-content-center mac-win-tab\">\r\n<div class=\"col-md-6\">\r\n<ul id=\"myTab\" class=\"nav nav-tabs justify-content-center border-primary\" role=\"tablist\">\r\n<li class=\"nav-item\" role=\"presentation\"><button id=\"home-tab\" class=\"nav-link bg-transparent px-4 active\" role=\"tab\" type=\"button\" data-toggle=\"tab\" data-target=\"#home\" aria-controls=\"home\" aria-selected=\"true\"> Windows<\/button><\/li>\r\n<li class=\"nav-item\" role=\"presentation\"><button id=\"profile-tab\" class=\"nav-link bg-transparent px-4\" role=\"tab\" type=\"button\" data-toggle=\"tab\" data-target=\"#profile\" aria-controls=\"profile\" aria-selected=\"false\">Mac<\/button><\/li>\r\n<li class=\"nav-item\" role=\"presentation\"><button id=\"linux-tab\" class=\"nav-link bg-transparent px-4\" role=\"tab\" type=\"button\" data-toggle=\"tab\" data-target=\"#linux\" aria-controls=\"linux\" aria-selected=\"false\">Linux<\/button><\/li>\r\n<\/ul>\r\n<div id=\"myTabContent\" class=\"tab-content\">\r\n<div id=\"home\" class=\"tab-pane fade active show\" role=\"tabpanel\" aria-labelledby=\"home-tab\"><span class=\"block_btn\"><a class=\"custom-download-btn\" href=\"https:\/\/www.arysontechnologies.com\/demo-version\/Aryson-IMAP-Backup-Tool_win.exe\"> Download Now<\/a>\u00a0\u00a0<a class=\"custom-buy-btn\" href=\"https:\/\/www.arysontechnologies.com\/imap-backup\/buy-now.php\"> Purchase Now<\/a><\/span><\/div>\r\n<div id=\"profile\" class=\"tab-pane fade\" role=\"tabpanel\" aria-labelledby=\"profile-tab\"><span class=\"block_btn\"><a class=\"custom-download-btn\" href=\"https:\/\/www.arysontechnologies.com\/demo-version\/Aryson-Imap-Backup-for-mac.dmg\"> Download Now<\/a>\u00a0\u00a0<a class=\"custom-buy-btn\" href=\"https:\/\/www.arysontechnologies.com\/mac\/imap-backup\/buy.php\"> Purchase Now<\/a><\/span><\/div>\r\n<div id=\"linux\" class=\"tab-pane fade\" role=\"tabpanel\" aria-labelledby=\"linux-tab\"><span class=\"block_btn\"><a class=\"custom-download-btn\" href=\"https:\/\/www.arysontechnologies.com\/demo-version\/Aryson-IMAP-Backup-Tool-unix.sh\"> Download Now<\/a>\u00a0\u00a0<a class=\"custom-buy-btn\" href=\"https:\/\/www.arysontechnologies.com\/linux-unix\/imap-buy.php\"> Purchase Now<\/a><\/span><\/div>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title ez-toc-toggle\" style=\"cursor:pointer\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#Quick_Way_to_Migrate_IMAP_to_Office_365\" >Quick Way to Migrate IMAP to Office 365<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#How_to_Migrate_1000_Mailboxes_from_IMAP_to_Office_365\" >How to Migrate 1000 Mailboxes from IMAP to Office 365?\u00a0<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#Method_1_Manually_Migrate_IMAP_Emails_to_Office_365\" >Method 1: Manually Migrate IMAP Emails to Office 365<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#Why_Users_Avoid_Using_the_Manual_Method\" >Why Users Avoid Using the Manual Method\u00a0<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#Method_2_Professional_Method_to_Migrate_1000_Mailboxes_from_IMAP_to_O365\" >Method 2: Professional Method to Migrate 1000 Mailboxes from IMAP to O365<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#Step-by-Step_Process_to_Convert_Emails_from_IMAP_to_Office_365\" >Step-by-Step Process to Convert Emails from IMAP to Office 365<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#Key_Features_of_the_Aryson_IMAP_Backup_Tool\" >Key Features of the Aryson IMAP Backup Tool\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#Daniels_Success_Story\" >Daniel\u2019s Success Story<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#Conclusion\" >Conclusion\u00a0<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Quick_Way_to_Migrate_IMAP_to_Office_365\"><\/span>Quick Way to Migrate IMAP to Office 365<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<ol>\r\n<li aria-level=\"1\">First, install &amp; run the <strong>Aryson IMAP Backup Tool<\/strong> on your system.<\/li>\r\n<li aria-level=\"1\">After that, enter the <strong>IMAP credentials<\/strong> &gt;&gt; <strong>Login <\/strong>IMAP server account.<\/li>\r\n<li aria-level=\"1\"><strong>Select <\/strong>the required IMAP data &gt;&gt; select <strong>Office 365<\/strong> as the destination &gt;&gt; <strong>log in<\/strong>.\u00a0<\/li>\r\n<li aria-level=\"1\">Lastly, apply the <strong>required filters<\/strong> of the software as required &gt;&gt; Click <strong>Next<\/strong>.\u00a0<\/li>\r\n<\/ol>\r\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"How_to_Migrate_1000_Mailboxes_from_IMAP_to_Office_365\"><\/span>How to Migrate 1000 Mailboxes from IMAP to Office 365?\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>In this section of the article, we will mainly focus on the manual and automated methods to migrate IMAP emails to Office 365. It is essential to choose the right method to achieve a successful migration. Go through both the methods and choose either one as per your requirement.\u00a0<\/p>\r\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_1_Manually_Migrate_IMAP_Emails_to_Office_365\"><\/span>Method 1: Manually Migrate IMAP Emails to Office 365<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Users can utilize the <em>Exchange Admin Center<\/em> in order to manually migrate IMAP emails to O365. It basically allows you to migrate IMAP mailboxes using a CSV file, but the process is <em>slightly technical<\/em> and <em>time-consuming<\/em>. Here is how you can perform it:<\/p>\r\n<ol>\r\n<li aria-level=\"1\">First, log in to the <strong>Microsoft 365 Admin Center<\/strong> &gt;&gt; <strong>ensure all user accounts are created<\/strong> with licenses assigned.<\/li>\r\n<li aria-level=\"1\">After that, open the <strong>Exchange Admin Center (EAC)<\/strong> &gt;&gt; <strong>Recipients <\/strong>&gt;&gt; <strong>Migration &gt;&gt; More (\u2026) &gt;&gt;\u00a0<\/strong><\/li>\r\n<li aria-level=\"1\"><strong>Create the Migration Endpoints &gt;&gt; New (+) &gt;&gt; Select IMAP &gt;&gt; Enter server address and port &gt;&gt; Test and save.<\/strong><\/li>\r\n<li aria-level=\"1\"><strong>Then, prepare a CSV file<\/strong> with three columns only: <strong>EmailAddress, UserName, and Password<\/strong>.<\/li>\r\n<li aria-level=\"1\">In EAC, click on + <strong>New <\/strong>&gt;&gt; <strong>Migrate to Exchange Online<\/strong> &gt;&gt; <strong>IMAP Migration.\u00a0<\/strong><\/li>\r\n<li aria-level=\"1\">Now, <strong>upload CSV<\/strong> &gt;&gt; <strong>Select your endpoint<\/strong> &gt;&gt; <strong>Name the batch<\/strong> &gt;&gt; Click <strong>Start<\/strong>.<\/li>\r\n<li aria-level=\"1\">Wait for all mailboxes to show Synced &gt;&gt; Click <strong>Complete Migration Batch<\/strong>.<\/li>\r\n<li aria-level=\"1\"><strong>At last, update MX<\/strong> and <strong>Autodiscover DNS records<\/strong> to point to Microsoft 365 and allow up to 72 hours for propagation.<\/li>\r\n<\/ol>\r\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Why_Users_Avoid_Using_the_Manual_Method\"><\/span>Why Users Avoid Using the Manual Method\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h4>\r\n<ul>\r\n<li aria-level=\"1\">IMAP migration transfers emails only; <em>contacts and calendars are excluded<\/em>.<\/li>\r\n<li aria-level=\"1\"><em>Moreover, CSV preparation errors<\/em> cause entire migration batches to fail instantly.<\/li>\r\n<li aria-level=\"1\">Additionally, even timeout errors may take place due to large mailboxes.\u00a0<\/li>\r\n<li aria-level=\"1\"><em>Folder mapping breaks<\/em> frequently with GoDaddy-hosted IMAP environments.<\/li>\r\n<li aria-level=\"1\"><em>Also, there is no built-in duplicate detection feature that<\/em> creates redundant emails.<\/li>\r\n<\/ul>\r\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_2_Professional_Method_to_Migrate_1000_Mailboxes_from_IMAP_to_O365\"><\/span>Method 2: Professional Method to Migrate 1000 Mailboxes from IMAP to O365<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Most of the large-scale organizations handle thousands of mailboxes. It is important to carefully migrate this data in a way that the data integrity is maintained. Thus, this is the primary aim of the Aryson IMAP Backup Tool. This software connects directly to any IMAP-enabled server, including GoDaddy Webmail, cPanel, Zimbra, and hosted Exchange, and migrates mailbox data straight into Office 365. Using the CSV import feature of the same software, you can convert IMAP emails to PST efficiently, without any data loss.<\/p>\r\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Step-by-Step_Process_to_Convert_Emails_from_IMAP_to_Office_365\"><\/span>Step-by-Step Process to Convert Emails from IMAP to Office 365<span class=\"ez-toc-section-end\"><\/span><\/h4>\r\n<ol>\r\n<li aria-level=\"1\">Install and open <strong>Aryson IMAP Backup Tool<\/strong> on Windows &gt;&gt; <strong>Run <\/strong>as administrator.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3312\" style=\"margin: 20px 0;\" src=\"https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/1.webp\" alt=\"Install and open Aryson IMAP Backup Tool\" width=\"1252\" height=\"702\" srcset=\"https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/1.webp 1252w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/1-300x168.webp 300w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/1-1024x574.webp 1024w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/1-768x431.webp 768w\" sizes=\"auto, (max-width: 1252px) 100vw, 1252px\" \/><\/li>\r\n<li aria-level=\"1\">After that, choose the <strong>IMAP migration card &gt;&gt; log in to IMAP via credentials.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3313\" style=\"margin: 20px 0;\" src=\"https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/2.webp\" alt=\"MAP migration card &gt;&gt; log in to IMAP via credentials\" width=\"1252\" height=\"702\" srcset=\"https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/2.webp 1252w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/2-300x168.webp 300w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/2-1024x574.webp 1024w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/2-768x431.webp 768w\" sizes=\"auto, (max-width: 1252px) 100vw, 1252px\" \/><\/strong><\/li>\r\n<li aria-level=\"1\">Select the required <strong>mailbox folders<\/strong> from the folder tree &gt;&gt; click <strong>Next<\/strong>.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3314\" style=\"margin: 20px 0;\" src=\"https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/3.webp\" alt=\"required mailbox folders\" width=\"1252\" height=\"702\" srcset=\"https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/3.webp 1252w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/3-300x168.webp 300w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/3-1024x574.webp 1024w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/3-768x431.webp 768w\" sizes=\"auto, (max-width: 1252px) 100vw, 1252px\" \/><\/li>\r\n<li aria-level=\"1\">Now, choose <strong>Office 365\/Outlook <\/strong>under the<strong> Email Clients <\/strong>drop-down list<strong>.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3315\" style=\"margin: 20px 0;\" src=\"https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/4.webp\" alt=\"choose Office 365\/Outlook under the Email Clients\" width=\"1252\" height=\"702\" srcset=\"https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/4.webp 1252w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/4-300x168.webp 300w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/4-1024x574.webp 1024w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/4-768x431.webp 768w\" sizes=\"auto, (max-width: 1252px) 100vw, 1252px\" \/><\/strong><\/li>\r\n<li aria-level=\"1\">Log in via the <strong>Modern OAuth2.0<\/strong> or <strong>Impersonation <\/strong>method.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3316\" style=\"margin: 20px 0;\" src=\"https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/5.webp\" alt=\"Modern OAuth2.0 or Impersonation\" width=\"1252\" height=\"702\" srcset=\"https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/5.webp 1252w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/5-300x168.webp 300w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/5-1024x574.webp 1024w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/5-768x431.webp 768w\" sizes=\"auto, (max-width: 1252px) 100vw, 1252px\" \/><\/li>\r\n<li aria-level=\"1\">Use the <strong>built-in features<\/strong> of the software as per the requirement<strong>. <img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3317\" style=\"margin: 20px 0;\" src=\"https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/6.webp\" alt=\"built-in features\" width=\"1252\" height=\"702\" srcset=\"https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/6.webp 1252w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/6-300x168.webp 300w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/6-1024x574.webp 1024w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/6-768x431.webp 768w\" sizes=\"auto, (max-width: 1252px) 100vw, 1252px\" \/><\/strong><\/li>\r\n<li aria-level=\"1\">At last, click on the <strong>Next <\/strong>button to begin the migration. <img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3318\" style=\"margin: 20px 0;\" src=\"https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/7.webp\" alt=\"click on the Next button to begin the migration\" width=\"1252\" height=\"702\" srcset=\"https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/7.webp 1252w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/7-300x168.webp 300w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/7-1024x574.webp 1024w, https:\/\/www.arysontechnologies.com\/how-to\/wp-content\/uploads\/2023\/07\/7-768x431.webp 768w\" sizes=\"auto, (max-width: 1252px) 100vw, 1252px\" \/><\/li>\r\n<\/ol>\r\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Key_Features_of_the_Aryson_IMAP_Backup_Tool\"><\/span>Key Features of the Aryson IMAP Backup Tool\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h4>\r\n<ul>\r\n<li aria-level=\"1\"><em>Bulk CSV import migrates<\/em> 1000+ IMAP mailboxes without manual setup.<\/li>\r\n<li aria-level=\"1\">Even the original folder structure and email metadata stay completely intact.<\/li>\r\n<li aria-level=\"1\">OAuth 2.0 ensures secure, <em>token-based Office 365 authentication<\/em>.<\/li>\r\n<li aria-level=\"1\"><em>Furthermore, the duplicate removal feature <\/em>skips redundant emails.\u00a0<\/li>\r\n<li aria-level=\"1\"><em>Date-range filters<\/em> let IT admins migrate only relevant data.<\/li>\r\n<li aria-level=\"1\">Moreover, you can <strong><a href=\"https:\/\/www.arysontechnologies.com\/blog\/export-imap-emails-to-mbox-file-format\/\" target=\"_blank\" rel=\"noopener\">export IMAP to MBOX<\/a><\/strong> within a few seconds.\u00a0<\/li>\r\n<li aria-level=\"1\"><em>Free demo tests<\/em> up to<em> 50 emails<\/em> per folder.<\/li>\r\n<\/ul>\r\n<p>Not just conversion or migration, the same software can be used to <a href=\"https:\/\/www.arysontechnologies.com\/blog\/download-all-emails-from-imap-server-directly\/\" target=\"_blank\" rel=\"noopener\"><strong>download all emails from IMAP Server<\/strong><\/a> without any issues.\u00a0<\/p>\r\n<div style=\"border: 2px solid #FF69B4; padding: 10px; margin-top: 10px; margin-bottom: 10px; text-align: center; border-radius: 25px; background-color: #e6f2ff; font-family: Arial, sans-serif; font-size: 16px; line-height: 1.5;\">\r\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Daniels_Success_Story\"><\/span><em>Daniel\u2019s Success Story<\/em><span class=\"ez-toc-section-end\"><\/span><\/h4>\r\n<p><em><strong>Daniel Harris, an IT admin at a logistics firm in Ohio,<\/strong> had 1,200 IMAP mailboxes to move to Office 365. Manual migration kept stopping at 400 accounts. He switched to <strong>Aryson IMAP Backup Tool to migrate IMAP emails to Microsoft 365 platform<\/strong>, loaded the CSV, and finished the entire migration\u2014folders and attachments intact.<\/em><\/p>\r\n<\/div>\r\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>Manual IMAP migration through the Exchange Admin Center has clear limits. Timeout errors, broken folder mapping, and missing contacts become persistent problems once the mailbox count crosses a few hundred. IT professionals who manage large-scale migrations need a solution built for volume. The Aryson IMAP Backup Tool can efficiently migrate 1,000 mailboxes with the help of its CSV import feature.<\/p>\r\n<h3 class=\"faq-main_heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n\r\n<div class=\"schema-faq wp-block-yoast-faq-block\">\r\n<div id=\"faq-question-1782912780354\" class=\"schema-faq-section\"><strong class=\"schema-faq-question\"><strong>Q.1 Can I use IMAP with Office 365?<\/strong><br \/><\/strong>\r\n<p class=\"schema-faq-answer\"><strong>Ans: <\/strong>Yes. Office 365 supports IMAP for incoming email access. IT professionals can configure IMAP settings directly within Outlook or migrate existing IMAP mailboxes into Office 365 using the Aryson IMAP Backup Tool.<\/p>\r\n<\/div>\r\n<div id=\"faq-question-1782912783407\" class=\"schema-faq-section\"><strong class=\"schema-faq-question\"><strong>Q.2 What is the best way to migrate 1000 IMAP mailboxes to Office 365?<\/strong><br \/><\/strong>\r\n<p class=\"schema-faq-answer\"><strong>Ans: <\/strong>Aryson IMAP Backup Tool is the most reliable option. It uses bulk CSV import to migrate 1,000+ mailboxes &#8211; without timeout errors or manual per-account configuration by IT teams.<\/p>\r\n<\/div>\r\n<div id=\"faq-question-1782912784327\" class=\"schema-faq-section\"><strong class=\"schema-faq-question\"><strong>Q.3 Can I migrate IMAP mailboxes with attachments?<\/strong><br \/><\/strong>\r\n<p class=\"schema-faq-answer\"><strong>Ans: <\/strong>Yes. The software migrates complete mailbox data, including all attachments. Email formatting, inline images, and file attachments transfer intact to the Office 365 destination without any data loss during migration.<\/p>\r\n<\/div>\r\n<div id=\"faq-question-1782912786407\" class=\"schema-faq-section\"><strong class=\"schema-faq-question\"><strong>Q.4 Does the tool preserve folder hierarchy during migration?<\/strong><br \/><\/strong>\r\n<p class=\"schema-faq-answer\"><strong>Ans: <\/strong>Yes. Aryson IMAP Backup Tool maintains the original folder structure throughout migration. IT professionals receive an accurately mapped Office 365 mailbox that mirrors the source IMAP account&#8217;s complete folder organization.<\/p>\r\n<\/div>\r\n<div id=\"faq-question-1782912786902\" class=\"schema-faq-section\"><strong class=\"schema-faq-question\"><strong>Q.5 Can I preview emails and search specific folders before migration?<\/strong><br \/><\/strong>\r\n<p class=\"schema-faq-answer\"><strong>Ans: <\/strong>Yes. The software provides a built-in preview panel. IT professionals can browse mailbox folders, search emails by subject, sender, or recipient, and verify content before initiating the actual migration process.<\/p>\r\n<\/div>\r\n<div id=\"faq-question-1782912787439\" class=\"schema-faq-section\"><strong class=\"schema-faq-question\"><strong>Q.6 Does the IMAP Backup Tool support batch email conversion?<\/strong><br \/><\/strong>\r\n<p class=\"schema-faq-answer\"><strong>Ans: <\/strong>Yes. Batch mode allows IT teams to import multiple IMAP account credentials via CSV. The software processes all accounts simultaneously, converting and migrating mailbox data to Office 365 without interruption.<\/p>\r\n<\/div>\r\n<div id=\"faq-question-1782912787951\" class=\"schema-faq-section\"><strong class=\"schema-faq-question\"><strong>Q.7 Is it possible to assign a custom folder name to the migrated data?<\/strong><\/strong>\r\n<p class=\"schema-faq-answer\"><strong>Ans: <\/strong>Yes. The software allows IT professionals to assign custom folder names to migrated mailbox data. This helps organizations maintain a structured, easily identifiable mailbox organization inside the destination Office 365 tenant.<\/p>\r\n<\/div>\r\n<div id=\"faq-question-1782912788575\" class=\"schema-faq-section\"><strong class=\"schema-faq-question\"><strong>Q.8 Is there an option to back up emails within a specific date range?<\/strong><br \/><\/strong>\r\n<p class=\"schema-faq-answer\"><strong>Ans: <\/strong>Yes. The date range filter restricts migration to emails within a <em>defined start and end date<\/em>. IT admins use this for phased migrations or archiving only historically relevant mailbox data.<\/p>\r\n<\/div>\r\n<div id=\"faq-question-1782912789734\" class=\"schema-faq-section\"><strong class=\"schema-faq-question\"><strong>Q.9 How does the tool handle duplicate emails during migration or backup?<\/strong><br \/><\/strong>\r\n<p class=\"schema-faq-answer\"><strong>Ans: <\/strong>The <em>duplicate detection feature<\/em> identifies and skips redundant emails. IT professionals receive a clean, clutter-free Office 365 mailbox without manually reviewing or removing duplicate items after migration completes.<\/p>\r\n<\/div>\r\n<div id=\"faq-question-1782912790238\" class=\"schema-faq-section\"><strong class=\"schema-faq-question\"><strong>Q.10 Does the tool support splitting large PST files and merging PDF files?<\/strong><br \/><\/strong>\r\n<p class=\"schema-faq-answer\"><strong>Ans: <\/strong>Yes. The Aryson software supports <em>splitting oversized PST<\/em> output files into smaller segments. IT professionals can also merge multiple PDF exports into a single file for organized archival and compliance purposes.<\/p>\r\n<\/div>\r\n<div id=\"faq-question-1782912791263\" class=\"schema-faq-section\"><strong class=\"schema-faq-question\"><strong>Q.11 How does the software protect user data integrity during the process?<\/strong><br \/><\/strong>\r\n<p class=\"schema-faq-answer\"><strong>Ans: <\/strong>The software uses <em>secure authentication protocols<\/em> and advanced algorithms throughout migration. Every email, attachment, and folder transfers without modification, ensuring complete data integrity from the source IMAP server to Office 365.<\/p>\r\n<\/div>\r\n<div id=\"faq-question-1782912791935\" class=\"schema-faq-section\"><strong class=\"schema-faq-question\"><strong>Q.12 What kind of help can I get through 24\/7 chat support?<\/strong><br \/><\/strong>\r\n<p class=\"schema-faq-answer\"><strong>Ans: <\/strong>Aryson&#8217;s support team assists IT professionals with installation, configuration, credential errors, and migration failures. 24\/7 chat support ensures migration projects stay on track without prolonged delays or unresolved technical issues.<\/p>\r\n<\/div>\r\n<\/div>\r\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;1724&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;4&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;5&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;5\\\/5 - (4 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Migrate 1000 Mailboxes from IMAP to Office 365 for IT Admins&quot;,&quot;width&quot;:&quot;142.5&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 142.5px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            5\/5 - (4 votes)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Query: Our company is switching from a hosted IMAP server to Office 365, and we have over 1,000 user mailboxes<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/\">Read More<\/a><\/p>\n","protected":false},"author":6,"featured_media":3311,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33],"tags":[],"class_list":["post-1724","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cloud-migration"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Migrate 1000 Mailboxes from IMAP to Office 365 for IT Admins<\/title>\n<meta name=\"description\" content=\"Migrate 1000 mailboxes from IMAP to Office 365 in 2026 with a secure process, 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It uses bulk CSV import to migrate 1,000+ mailboxes - without timeout errors or manual per-account configuration by IT teams.<br>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#faq-question-1782912784327","position":3,"url":"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#faq-question-1782912784327","name":"Q.3 Can I migrate IMAP mailboxes with attachments?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans: <\/strong>Yes. The software migrates complete mailbox data, including all attachments. 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This helps organizations maintain a structured, easily identifiable mailbox organization inside the destination Office 365 tenant.<br>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#faq-question-1782912788575","position":8,"url":"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#faq-question-1782912788575","name":"Q.8 Is there an option to back up emails within a specific date range?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans: <\/strong>Yes. The date range filter restricts migration to emails within a <em>defined start and end date<\/em>. IT admins use this for phased migrations or archiving only historically relevant mailbox data.<br>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#faq-question-1782912789734","position":9,"url":"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#faq-question-1782912789734","name":"Q.9 How does the tool handle duplicate emails during migration or backup?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans: <\/strong>The <em>duplicate detection feature<\/em> identifies and skips redundant emails. IT professionals receive a clean, clutter-free Office 365 mailbox without manually reviewing or removing duplicate items after migration completes.<br>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#faq-question-1782912790238","position":10,"url":"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#faq-question-1782912790238","name":"Q.10 Does the tool support splitting large PST files and merging PDF files?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans: <\/strong>Yes. The Aryson software supports <em>splitting oversized PST<\/em> output files into smaller segments. IT professionals can also merge multiple PDF exports into a single file for organized archival and compliance purposes.<br>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#faq-question-1782912791263","position":11,"url":"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#faq-question-1782912791263","name":"Q.11 How does the software protect user data integrity during the process?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans: <\/strong>The software uses <em>secure authentication protocols<\/em> and advanced algorithms throughout migration. Every email, attachment, and folder transfers without modification, ensuring complete data integrity from the source IMAP server to Office 365.<br>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#faq-question-1782912791935","position":12,"url":"https:\/\/www.arysontechnologies.com\/how-to\/migrate-imap-emails-to-office-365-account\/#faq-question-1782912791935","name":"Q.12 What kind of help can I get through 24\/7 chat support?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans: <\/strong>Aryson's support team assists IT professionals with installation, configuration, credential errors, and migration failures. 24\/7 chat support ensures migration projects stay on track without prolonged delays or unresolved technical issues.<br>","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/www.arysontechnologies.com\/how-to\/wp-json\/wp\/v2\/posts\/1724","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.arysontechnologies.com\/how-to\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.arysontechnologies.com\/how-to\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/how-to\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/how-to\/wp-json\/wp\/v2\/comments?post=1724"}],"version-history":[{"count":7,"href":"https:\/\/www.arysontechnologies.com\/how-to\/wp-json\/wp\/v2\/posts\/1724\/revisions"}],"predecessor-version":[{"id":3322,"href":"https:\/\/www.arysontechnologies.com\/how-to\/wp-json\/wp\/v2\/posts\/1724\/revisions\/3322"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/how-to\/wp-json\/wp\/v2\/media\/3311"}],"wp:attachment":[{"href":"https:\/\/www.arysontechnologies.com\/how-to\/wp-json\/wp\/v2\/media?parent=1724"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/how-to\/wp-json\/wp\/v2\/categories?post=1724"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/how-to\/wp-json\/wp\/v2\/tags?post=1724"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}