{"id":1682,"date":"2026-06-23T12:14:42","date_gmt":"2026-06-23T12:14:42","guid":{"rendered":"https:\/\/www.arysontechnologies.com\/blog\/?p=1682"},"modified":"2026-07-03T06:35:38","modified_gmt":"2026-07-03T06:35:38","slug":"how-to-upload-pst-into-office365","status":"publish","type":"post","link":"https:\/\/www.arysontechnologies.com\/blog\/how-to-upload-pst-into-office365\/","title":{"rendered":"Upload 10000+ Emails PST to Office 365: Easy Guide for 2026"},"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;\">\n<p><em><strong>Query: <span style=\"font-weight: 400;\">I have a <\/span><span style=\"font-weight: 400;\">95 GB PST file<\/span><span style=\"font-weight: 400;\"> that contains emails and calendars from 1+ year ago at Rackspace. I would like to import that file into my new Office 365 account. I am using 3.1 GB currently at Microsoft 365. When I try to import the PST file into Outlook, I receive a memory error and am unable to complete the task. I have <\/span><span style=\"font-weight: 400;\">32 GB of RAM<\/span><span style=\"font-weight: 400;\">. I have a <\/span><span style=\"font-weight: 400;\">100 GB mailbox<\/span> <span style=\"font-weight: 400;\">limit <\/span><span style=\"font-weight: 400;\">at Microsoft. I have a ticket open with Microsoft about importing this, but they haven&#8217;t provided a solution. <\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">What is the best way to upload 10000+ email PST to Office 365 without facing Outlook memory errors or risking data loss? <\/span><\/strong><\/em><\/p>\n<\/div>\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%;\">\n<p><em><strong>Summary: <span style=\"font-weight: 400;\">A large segment of organizations and enterprises consists of Outlook data in PST files, and moving that data into Office 365 isn&#8217;t always easy. Microsoft does offer built-in import options, but they come with rules, roles, and waiting periods. This blog walks IT admins through manual ways to upload 10000+ email PST to Office 365 and the <\/span><a href=\"https:\/\/www.arysontechnologies.com\/import-to-office365\/\" target=\"_blank\" rel=\"noopener\">Aryson PST to Office 365 Migration Tool<\/a><span style=\"font-weight: 400;\"> to efficiently import bulk PST files. <\/span><\/strong><\/em><\/p>\n<div class=\"row justify-content-center mac-win-tab\">\n<div class=\"col-md-6\">\n<ul id=\"myTab\" class=\"nav nav-tabs justify-content-center border-primary\" role=\"tablist\">\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>\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>\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>\n<\/ul>\n<div id=\"myTabContent\" class=\"tab-content\">\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-PST-to-Office365-Tool_win.exe\"> Download Now<\/a>\u00a0\u00a0<a class=\"custom-buy-btn\" href=\"https:\/\/www.arysontechnologies.com\/import-to-office365\/buy.php\"> Purchase Now<\/a><\/span><\/div>\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-PST-to-Office365-Tool_mac.dmg\"> Download Now<\/a>\u00a0\u00a0<a class=\"custom-buy-btn\" href=\"https:\/\/www.arysontechnologies.com\/mac\/pst-to-office365\/buy-for-mac.php\"> Purchase Now<\/a><\/span><\/div>\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-PST-to-Office-365-Tool-unix.sh\"> Download Now<\/a>\u00a0\u00a0<a class=\"custom-buy-btn\" href=\"https:\/\/www.arysontechnologies.com\/linux-unix\/buy-pst-to-office365.php\"> Purchase Now<\/a><\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\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\" style=\"cursor:inherit\">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\/blog\/how-to-upload-pst-into-office365\/#Professional_Roles_That_Benefit_from_PST_to_Office_365_Import\" >Professional Roles That Benefit from PST to Office 365 Import<\/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\/blog\/how-to-upload-pst-into-office365\/#Proven_Solutions_to_Upload_10000_Email_PST_to_Office_365\" >Proven Solutions to Upload 10000+ Email PST to Office 365<\/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\/blog\/how-to-upload-pst-into-office365\/#Method_1_Upload_PST_to_Office_365_Using_Outlook\" >Method 1: Upload PST to Office 365 Using Outlook<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.arysontechnologies.com\/blog\/how-to-upload-pst-into-office365\/#Method_2_Network_Upload_Method\" >Method 2: Network Upload Method<\/a><\/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\/blog\/how-to-upload-pst-into-office365\/#Method_3_Drive_Shipping_Method\" >Method 3: Drive Shipping Method<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.arysontechnologies.com\/blog\/how-to-upload-pst-into-office365\/#How_Does_the_PST_Import_Process_Handle_Duplicate_Email_Items\" >How Does the PST Import Process Handle Duplicate Email Items?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.arysontechnologies.com\/blog\/how-to-upload-pst-into-office365\/#Enterprise-Level_Solution_to_Upload_10000_Email_PST_to_Office_365\" >Enterprise-Level Solution to Upload 10000+ Email PST 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-8\" href=\"https:\/\/www.arysontechnologies.com\/blog\/how-to-upload-pst-into-office365\/#Simplified_Steps_to_Migrate_100000_PST_Emails_to_Microsoft_365_Account\" >Simplified Steps to Migrate 100,000+ PST Emails to Microsoft 365 Account:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.arysontechnologies.com\/blog\/how-to-upload-pst-into-office365\/#How_Aryson_PST_to_Office_365_Converter_Surpasses_The_Manual_Methods\" >How Aryson PST to Office 365 Converter Surpasses The Manual Methods<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.arysontechnologies.com\/blog\/how-to-upload-pst-into-office365\/#Davids_Success_Story\" >David\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-11\" href=\"https:\/\/www.arysontechnologies.com\/blog\/how-to-upload-pst-into-office365\/#Conclusion\" >Conclusion<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.arysontechnologies.com\/blog\/how-to-upload-pst-into-office365\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Professional_Roles_That_Benefit_from_PST_to_Office_365_Import\"><\/span>Professional Roles That Benefit from PST to Office 365 Import<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li aria-level=\"1\"><em>IT admins<\/em> are migrating old desktop Outlook data to the cloud.<\/li>\n<li aria-level=\"1\"><em>Organizations <\/em>are consolidating PST files from multiple employee systems.<\/li>\n<li aria-level=\"1\"><em>Enterprises are <\/em>preparing for compliance audits with archived mail records.<\/li>\n<li aria-level=\"1\"><em>Professionals joining a new company<\/em> who need access to old PST archives.<\/li>\n<li aria-level=\"1\"><em>Remote teams<\/em> are shifting from local storage to Office 365 mailboxes.<\/li>\n<li aria-level=\"1\">IT professionals handling mailbox cleanup after device replacements.<\/li>\n<\/ul>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Proven_Solutions_to_Upload_10000_Email_PST_to_Office_365\"><\/span>Proven Solutions to Upload 10000+ Email PST to Office 365<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Now that we have covered who typically needs this migration, let&#8217;s walk through the actual methods of PST to Office 365 import. Go through each manual approach carefully and weigh the requirements against your PST file size and technical knowledge. If the manual workflows are complicated for your situation, the tool-based method covered later in this blog is worth considering.<\/p>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_1_Upload_PST_to_Office_365_Using_Outlook\"><\/span>Method 1: Upload PST to Office 365 Using Outlook<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li aria-level=\"1\">Launch <strong>Microsoft Outlook<\/strong>&gt;&gt;<strong> File&gt;&gt;<\/strong> <strong>Open &amp; Export button.\u00a0<\/strong><\/li>\n<li aria-level=\"1\">An <strong>import and export<\/strong> wizard has now opened.<\/li>\n<li aria-level=\"1\">Then, click on \u201c<strong>Import from another program or file.&#8221;<\/strong><\/li>\n<li aria-level=\"1\">Now choose <strong>Outlook Data File (.pst)<\/strong> &gt;&gt; then click on the <strong>next <\/strong>button.<\/li>\n<li aria-level=\"1\">Select the <strong>.pst <\/strong>file as per your choice.<\/li>\n<li aria-level=\"1\">Click on the <strong>Finish <\/strong>button to complete the process<\/li>\n<\/ol>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_2_Network_Upload_Method\"><\/span>Method 2: Network Upload Method<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\n<li aria-level=\"1\">Sign in to the <strong>Microsoft Purview portal (admin account)<\/strong> &gt;&gt; <strong>Data lifecycle management<\/strong> &gt;&gt; <strong>Microsoft 365<\/strong> &gt;&gt; <strong>Import.\u00a0<\/strong><\/li>\n<li aria-level=\"1\">Launch the <strong>Azure AzCopy tool<\/strong> &gt;&gt; <strong>copy SAS URL.\u00a0<\/strong><\/li>\n<li aria-level=\"1\"><strong>Upload PST file<\/strong> via AzCopy.<\/li>\n<li aria-level=\"1\"><strong>View uploaded PST<\/strong> in Azure Storage Explorer (optional).<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<ul>\n<li aria-level=\"1\"><strong>Create a CSV mapping file.\u00a0<\/strong><\/li>\n<\/ul>\n<ol>\n<li aria-level=\"1\">Create a <strong>PST import job<\/strong> in the Purview portal &gt;&gt; <strong>import PST into mailboxes.\u00a0<\/strong><\/li>\n<\/ol>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_3_Drive_Shipping_Method\"><\/span>Method 3: Drive Shipping Method<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li aria-level=\"1\">Sign in to the <strong>Microsoft Purview portal<\/strong> (admin account) &gt;&gt; <strong>Data lifecycle management<\/strong> &gt;&gt; <strong>Microsoft 365<\/strong> &gt;&gt; <strong>Import.<\/strong><\/li>\n<li aria-level=\"1\"><strong>Download the Azure Import\/Export tool<\/strong> (WAImportExport.exe) &gt;&gt; get the <strong>storage key.\u00a0<\/strong><\/li>\n<li aria-level=\"1\"><strong>Copy PST files<\/strong> to a <em>BitLocker-encrypted<\/em> hard drive using a tool.<\/li>\n<li aria-level=\"1\"><strong>Generate a CSV mapping file <\/strong>for Azure storage migration.<\/li>\n<li aria-level=\"1\">Create an <strong>import job<\/strong> in the Purview portal.<\/li>\n<li aria-level=\"1\"><strong>Ship encrypted drive<\/strong> to Microsoft data center\u2014Microsoft uploads data to Azure (~7-10 biz days). After your hard drive is received at the Microsoft data center, it will take between 7 to 10 business days to upload the PST files to the Azure Storage area for your organization.<\/li>\n<\/ol>\n<p><strong>Note: <\/strong>Drive shipping availability is limited by region\/country and requires a Microsoft Enterprise Agreement. Drive Shipping to import PST files to Microsoft 365 is available through a Microsoft Enterprise Agreement (EA).<\/p>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"How_Does_the_PST_Import_Process_Handle_Duplicate_Email_Items\"><\/span>How Does the PST Import Process Handle Duplicate Email Items?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>This is a common concern for IT admins who migrate 10,000+ PST emails to Office 365 mailboxes. Microsoft&#8217;s native import tools generally don&#8217;t filter duplicates, so the same emails can appear twice if a PST is imported more than once into the same mailbox.<br \/>\nTo avoid this issue, you must consider the professional solution provided by Aryson below. This software detects duplicates and removes them via a <em>Remove Duplicates<\/em> feature built into it.<\/p>\n<div style=\"border: 2px solid #4A6FA5; padding: 10px; margin-top: 10px; margin-bottom: 10px; text-align: center; border-radius: 25px; background-color: #f4f7fb; font-family: Arial, sans-serif; font-size: 16px; line-height: 1.5;\">\n<h3 class=\"main_heading\" style=\"text-align: left;\"><span class=\"ez-toc-section\" id=\"Enterprise-Level_Solution_to_Upload_10000_Email_PST_to_Office_365\"><\/span>Enterprise-Level Solution to Upload 10000+ Email PST to Office 365<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: left;\">For enterprises and <strong>IT teams<\/strong> that deal with bulk PST files, the\u00a0<strong><em>Aryson Outlook to Office Migration Tool<\/em><\/strong>\u00a0offers a faster alternative to the manual Microsoft processes. This software allows users to <strong>import 10000+ PST emails to Office 365<\/strong> mailboxes, public folders, or online archives. Moreover, it does not require the\u00a0<em>installation of MS Outlook<\/em>\u00a0and also allows them to import Outlook data with\u00a0<strong><em>complete data integrity<\/em><\/strong>. This software also includes a\u00a0<strong><em>duplicate-removal filter<\/em><\/strong>, which addresses the duplicate concern raised above, along with\u00a0<em>date-range filters<\/em>\u00a0for selective migration.<\/p>\n<\/div>\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Simplified_Steps_to_Migrate_100000_PST_Emails_to_Microsoft_365_Account\"><\/span>Simplified Steps to Migrate 100,000+ PST Emails to Microsoft 365 Account:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ol>\n<li aria-level=\"1\">Download and install the <strong>Aryson Import PST to Office 365 Tool<\/strong>.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6678\" style=\"margin: 20px 0;\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/1-300x159.webp\" alt=\"Download Aryson Import PST to Office 365 Tool\" width=\"700\" height=\"372\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/1-300x159.webp 300w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/1-1024x544.webp 1024w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/1-768x408.webp 768w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/1-1536x816.webp 1536w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/1.webp 1920w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/li>\n<li aria-level=\"1\">Launch the tool and click <strong>Select PST <\/strong>or <strong>Select Folder<\/strong> to load PST files.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6672\" style=\"margin: 20px 0;\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/2-300x168.webp\" alt=\"Select PST or Select Folder\" width=\"700\" height=\"392\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/2-300x168.webp 300w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/2-1024x574.webp 1024w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/2-768x430.webp 768w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/2-1536x861.webp 1536w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/2.webp 1565w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/li>\n<li aria-level=\"1\">Select the required PST files or folder to import to Office 365<strong>. <img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6673\" style=\"margin: 20px 0;\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/3-300x168.webp\" alt=\"required PST files or folder\" width=\"700\" height=\"392\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/3-300x168.webp 300w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/3-1024x574.webp 1024w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/3-768x430.webp 768w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/3-1536x861.webp 1536w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/3.webp 1565w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/strong><\/li>\n<li aria-level=\"1\">Select <strong>Office 365 as<\/strong> the destination email client.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6674\" style=\"margin: 20px 0;\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/4-300x168.webp\" alt=\"Select Office 365 as the destination\" width=\"700\" height=\"392\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/4-300x168.webp 300w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/4-1024x574.webp 1024w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/4-768x430.webp 768w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/4-1536x861.webp 1536w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/4.webp 1565w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/li>\n<li aria-level=\"1\"><strong>Log in<\/strong> to the O365 account via <strong>modern auth<\/strong> or <strong>client secret<\/strong> methods.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6675\" style=\"margin: 20px 0;\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/5-300x168.webp\" alt=\"Log in to the O365 account via modern auth or client secret\" width=\"700\" height=\"392\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/5-300x168.webp 300w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/5-1024x574.webp 1024w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/5-768x430.webp 768w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/5-1536x861.webp 1536w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/5.webp 1565w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/li>\n<li aria-level=\"1\">Use the <strong>required filters<\/strong> of the software as per your requirements.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6676\" style=\"margin: 20px 0;\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/6-300x159.webp\" alt=\"Use the required filters\" width=\"700\" height=\"372\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/6-300x159.webp 300w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/6-1024x544.webp 1024w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/6-768x408.webp 768w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/6-1536x816.webp 1536w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/6.webp 1920w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/li>\n<li aria-level=\"1\">Click <strong>Start Migration<\/strong> to begin the PST to Office 365 migration.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6677\" style=\"margin: 20px 0;\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/7-300x159.webp\" alt=\"Click Start Export\" width=\"700\" height=\"372\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/7-300x159.webp 300w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/7-1024x544.webp 1024w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/7-768x408.webp 768w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/7-1536x816.webp 1536w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2020\/03\/7.webp 1920w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/li>\n<\/ol>\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"How_Aryson_PST_to_Office_365_Converter_Surpasses_The_Manual_Methods\"><\/span>How Aryson PST to Office 365 Converter Surpasses The Manual Methods<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ol>\n<li aria-level=\"1\"><strong><a href=\"https:\/\/www.arysontechnologies.com\/updates\/import-pst-to-thunderbird-without-outlook\/\" target=\"_blank\" rel=\"noopener\">Import PST files to Thunderbird<\/a><\/strong>, Gmail, IMAP, Hotmail, Yahoo, &amp; Zimbra successfully<\/li>\n<li aria-level=\"1\">Performs <em>batch conversion<\/em> of PST files to save the user&#8217;s time and effort.<\/li>\n<li aria-level=\"1\">It helps to <em>save a PST file as an MBOX file<\/em> and split a file of more than 500 MB into small pieces of MBOX<\/li>\n<li aria-level=\"1\">Offers a <em>direct export feature<\/em> to export Outlook PST to Gmail, Yahoo, Thunderbird, IMAP, Hotmail, Zimbra, etc<\/li>\n<li aria-level=\"1\">It offers two conversion modes, Single and Multiple, for converting PST files<\/li>\n<li aria-level=\"1\">The <em>Date-Range feature<\/em> sorts email items by providing the <em>start and end dates<\/em><\/li>\n<li aria-level=\"1\">A self-intuitive and easy-to-use GUI for converting the PST file into other file formats without any expertise<\/li>\n<li aria-level=\"1\">A free PST converter is available to evaluate the features and working of the utility software<\/li>\n<li aria-level=\"1\">Export the first 50 emails using the demo version of the software wizard.<\/li>\n<li aria-level=\"1\">It helps us to upload or <strong><a href=\"https:\/\/www.arysontechnologies.com\/blog\/how-to-import-pst-file-to-exchange-online\/\" target=\"_blank\" rel=\"noopener\">import PST file into Live Exchange<\/a><\/strong> server.<\/li>\n<li aria-level=\"1\">Allows saving and converting Outlook PST contacts to a CSV file<\/li>\n<\/ol>\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;\">\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Davids_Success_Story\"><\/span><em>David\u2019s Success Story <\/em><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p style=\"text-align: left;\"><em><strong>David, an IT administrator at a logistics company<\/strong><span style=\"font-weight: 400;\">, needed to upload a <\/span><span style=\"font-weight: 400;\">95 GB PST file<\/span><span style=\"font-weight: 400;\"> that contains over 100,000 emails to Office 365. Outlook repeatedly crashed with <\/span><span style=\"font-weight: 400;\">memory errors,<\/span><span style=\"font-weight: 400;\"> delaying the project. He switched to <\/span><strong>Aryson PST to Office 365 Converter<\/strong><span style=\"font-weight: 400;\">, which migrated all emails, attachments, and folder structures successfully. The migration finished without data loss, duplicates, or mailbox corruption.<\/span><\/em><\/p>\n<\/div>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To upload 10000+ email PST to Office 365, there are various procedures and methods available. You can either use the manual approach or the automatic approach. The professional way requires you to just download the software and upload the PST file to Office 365, which is the easiest way.<\/p>\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>\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1782215757460\"><strong class=\"schema-faq-question\"><strong>Q.1 How do I upload 10,000+ PST emails to Office 365 without Outlook?<\/strong><br><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> Aryson PST to Office 365 Converter directly uploads PST files to Office 365 without requiring Outlook installation. Simply add the PST file, authenticate your Office 365 account, and start the migration. The tool supports large-scale PST imports with ease.<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782215760119\"><strong class=\"schema-faq-question\"><strong>Q.2 Is there any PST file size limitation when uploading PST to Office 365?<\/strong><br><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> Aryson PST to Office 365 Converter supports both small and large PST files without imposing software-based size restrictions. It efficiently handles oversized PST files while maintaining data integrity. This makes it suitable for enterprise-level migrations.<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782215760607\"><strong class=\"schema-faq-question\"><strong>Q.3 Can I upload PST files to Office 365 archive mailboxes?<\/strong><br><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> Yes, the software allows migration of PST data to both primary and archive mailboxes in Office 365. Users can choose the desired destination during the migration process. This helps manage historical email records effectively.<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782215761080\"><strong class=\"schema-faq-question\"><strong>Q.4 Will the folder hierarchy remain intact after PST migration?<\/strong><br><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> Yes, Aryson PST to Office 365 Converter preserves the original folder hierarchy throughout the migration. All mailbox folders remain organized in the destination account. Email properties and metadata are also retained.<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782215762655\"><strong class=\"schema-faq-question\"><strong>Q.5 Can I create a custom folder in Office 365 for imported PST data?<\/strong><br><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> Yes, the software offers destination folder mapping options for better organization. Users can migrate PST content into existing or newly created folders. This prevents imported data from mixing with active mailbox content.<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782215763163\"><strong class=\"schema-faq-question\"><strong>Q.6 Does the tool remove duplicate emails before uploading PST files?<\/strong><br><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> Yes, Aryson PST to Office 365 Converter includes an advanced duplicate detection feature. It identifies previously migrated emails and skips duplicate items automatically. This helps reduce storage consumption and migration time.<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782215763624\"><strong class=\"schema-faq-question\"><strong>Q.7 Is there a free demo available for PST to Office 365 migration?<\/strong><br><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> Yes, Aryson provides a free demo version for evaluation purposes. Users can test the software&#8217;s interface, features, and migration workflow before purchasing. This helps verify compatibility with their requirements.<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782215764185\"><strong class=\"schema-faq-question\"><strong>Q.8 Is user data secure during PST to Office 365 migration?<\/strong><br><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> Yes, the software performs secure PST to Office 365 migration without altering the source data. It preserves email content, attachments, metadata, and folder structure. User credentials and mailbox data remain protected during the process.<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782215765135\"><strong class=\"schema-faq-question\"><strong>Q.9 What should I do if I face issues while uploading PST files to Office 365?<\/strong><br><\/strong> <p class=\"schema-faq-answer\"><strong>Answer:<\/strong> Aryson PST to Office 365 Converter generates detailed migration reports to help identify errors quickly. Users can review logs and retry the migration if needed. For additional assistance, dedicated technical support is available.<br><\/p> <\/div> <\/div>\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;1682&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;1&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 - (1 vote)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Upload 10000+ Emails PST to Office 365: Easy Guide for 2026&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 - (1 vote)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>You can upload pst into office 365 using four different methods, here is given steps to upload the PST file into Office 365 account. <\/p>\n","protected":false},"author":12,"featured_media":6681,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[139],"tags":[],"class_list":["post-1682","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-outlook"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Upload 10000+ Emails PST to Office 365: Easy Guide for 2026<\/title>\n<meta name=\"description\" content=\"You can upload pst into office 365 using 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