{"id":2445,"date":"2026-03-31T12:37:02","date_gmt":"2026-03-31T12:37:02","guid":{"rendered":"https:\/\/www.arysontechnologies.com\/updates\/?p=2445"},"modified":"2026-03-31T13:20:52","modified_gmt":"2026-03-31T13:20:52","slug":"import-large-pst-to-microsoft-365","status":"publish","type":"post","link":"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/","title":{"rendered":"How to Import Large PST Files (50GB+) to Microsoft (Office) 365"},"content":{"rendered":"<div class=\"block_sum mb-3\">\n<p><em>Handling very large PST files, like 50GB or more, can quickly become frustrating, especially when standard methods fail with errors such as memory issues in Outlook. Many users run into this problem even when their Microsoft 365 mailbox has enough storage capacity. This article provides the methods to import large PST to Office 365, which include the <a title=\"Import PST to Office 365\" href=\"https:\/\/www.arysontechnologies.com\/import-to-office365\/\" target=\"_blank\" rel=\"noopener\"><strong>Aryson Import PST to Office 365 Tool<\/strong><\/a> for secure migration.\u00a0<\/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<\/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\" rel=\"nofollow\"> Download Now<\/a>\u00a0\u00a0<a class=\"custom-buy-btn\" href=\"https:\/\/www.arysontechnologies.com\/import-to-office365\/buy.php\" rel=\"nofollow\"> 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\" rel=\"nofollow\"> Download Now<\/a>\u00a0\u00a0<a class=\"custom-buy-btn\" href=\"https:\/\/www.arysontechnologies.com\/mac\/pst-to-office365\/buy-for-mac.php\" rel=\"nofollow\"> Purchase Now<\/a><\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"user-query mb-3\">\n<p><strong>Daniel Query<\/strong>: I\u2019ve got a PST file around 95GB from my old Rackspace mailbox, and every time I try bringing it into Microsoft 365 through Outlook, it just fails with a memory error. My mailbox can handle up to 100GB, so I didn\u2019t expect this problem. Has anyone managed to deal with something like this\u2014maybe by breaking the file into smaller parts or using a different method?<\/p>\n<\/div>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 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 ' ><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\/updates\/import-large-pst-to-microsoft-365\/#About_PST_File_and_Why_Does_Size_Matter\" >About PST File and Why Does Size Matter<\/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\/updates\/import-large-pst-to-microsoft-365\/#Understand_the_Office_365_PST_Import_Limits\" >Understand the Office 365 &amp; PST Import Limits<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#Pre-Migration_Checklist_Import_Large_PST_to_Office_365\" >Pre-Migration Checklist: Import Large 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-4\" href=\"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#Method_01_Split_Oversized_PST_File_to_Office_365_for_Smooth_Import\" >Method 01: Split Oversized PST File to Office 365 for Smooth Import<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#Limitations_of_the_Manual_Method\" >Limitations of the Manual Method:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#Method_02_Use_Professional_Software_to_Import_Large_PST_to_Office_365\" >Method 02: Use Professional Software to Import Large 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-7\" href=\"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#Steps_to_Import_PST_File_to_Office_365\" >Steps to Import PST File to Office 365:<\/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-8\" href=\"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#Comparison_Manual_Method_Vs_Professional_Software\" >Comparison: Manual Method Vs Professional Software<\/a><\/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\/updates\/import-large-pst-to-microsoft-365\/#Common_Errors_When_Users_Import_Large_PST_to_Office_365\" >Common Errors When Users Import Large PST to Office 365<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#Conclusion\" >Conclusion<\/a><\/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\/updates\/import-large-pst-to-microsoft-365\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"About_PST_File_and_Why_Does_Size_Matter\"><\/span>About PST File and Why Does Size Matter<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Basically, a PST file (<strong>Personal Storage Table<\/strong>) is where Outlook stores your mailbox data on a local system. It includes things like emails and attachments. Many users use PST files when they want to keep a copy of their data or shift it from one account to another.<\/p>\n<p>File size becomes an issue when the PST starts getting too big. A larger file can slow Outlook down and sometimes cause errors during opening or importing. In many situations, the file may not load properly at all. That\u2019s why when you work with large PST files, especially those beyond 50GB, needs a more careful approach to avoid problems.<\/p>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Understand_the_Office_365_PST_Import_Limits\"><\/span>Understand the Office 365 &amp; PST Import Limits<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>If the PST file is larger than the import may<strong> fail or stop midway.<\/strong><\/li>\n<li>Direct import of oversized PST files can result in <strong>incomplete<\/strong> or <strong>failed imports.<\/strong><\/li>\n<li>Microsoft import methods like network upload &amp; drive shipping have their own restrictions.<\/li>\n<li>Large PST files may take a <strong>long time to uploa<\/strong>d and process.<\/li>\n<li>Likewise, there are <strong>data limits<\/strong> at the time of process which include item count per mailbox.<\/li>\n<\/ul>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Pre-Migration_Checklist_Import_Large_PST_to_Office_365\"><\/span>Pre-Migration Checklist: Import Large PST to Office 365<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Check the PST file size and make sure your Office 365 mailbox has <strong>enough available space<\/strong>.<\/li>\n<li>Scan the <strong>PST file for corruption<\/strong> before starting the import.<\/li>\n<li>Moreover, <strong>remove unnecessary or duplicate emails<\/strong> to reduce file size.<\/li>\n<li>Make sure you have a <strong>stable internet connection<\/strong> for large data transfers.<\/li>\n<li>Moreover, you need to verify that you have the <strong>required permissions<\/strong> in Office 365.<\/li>\n<li>Make sure to <strong>take a backup<\/strong> of your PST file to avoid data loss at the time of migration.<\/li>\n<\/ul>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_01_Split_Oversized_PST_File_to_Office_365_for_Smooth_Import\"><\/span>Method 01: Split Oversized PST File to Office 365 for Smooth Import<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Follow this method to import oversized PST File to Office 365 in a smooth way with the help of Outlook.\u00a0<\/p>\n<ol>\n<li>First, launch <strong>Microsoft Outlook<\/strong> on your computer.<\/li>\n<li>Then, click on the<strong> File tab<\/strong> &gt;&gt; open <strong>Account Settings<\/strong> and select <strong>Account Settings<\/strong> again.<\/li>\n<li>Now, go to the <strong>Data Files<\/strong> section and choose the <strong>large PST<\/strong> file you want to work with.<\/li>\n<li>Next, select <strong>Open File Location<\/strong> to find where the PST file is stored on your system.<\/li>\n<li>Afterward, break the large PST file into smaller files through the &#8221; <strong>Achieve<\/strong> &#8221; option.<\/li>\n<li>After splitting, <strong>return to Outlook<\/strong> and navigate to<strong> File <\/strong>&gt;&gt; <strong>Open &amp; Export<\/strong> &gt;&gt; <strong>Import\/Export.<\/strong><\/li>\n<li>Thereafter, pick <strong>Import from another program or file<\/strong>, then select <strong>Outlook Data File (.pst).<\/strong><\/li>\n<li>Locate one of the <strong>smaller PST files<\/strong> and choose your Office 365 mailbox as the destination.<\/li>\n<li>Now, follow the same steps to import each <strong>split PST <\/strong>file one by one.<\/li>\n<li>Once done, check your mailbox to confirm that all data has been imported properly.<\/li>\n<\/ol>\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Limitations_of_the_Manual_Method\"><\/span>Limitations of the Manual Method:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li>The process can be time-consuming when dealing with large PST files.<\/li>\n<li>It requires manual efforts to split and then import each file separately.<\/li>\n<li>The email hierarchy or folder structure may get altered at the time of splitting.<\/li>\n<li>If it is not managed carefully, then there is a chance of data duplication.<\/li>\n<\/ul>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_02_Use_Professional_Software_to_Import_Large_PST_to_Office_365\"><\/span>Method 02: Use Professional Software to Import Large PST to Office 365<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The <strong>Aryson Import PST to Office 365 Tool<\/strong> is made to simplify the migration process. It allows users to upload single or multiple PST files without data loss. This software supports bulk migration and saves business users time who handle large datasets. Also, it provides features like date filters and selective migration. The user can <strong><a title=\"Upload PST File to Microsoft 365\" href=\"https:\/\/www.arysontechnologies.com\/blog\/how-to-upload-pst-into-office365\/\" target=\"_blank\" rel=\"noopener\">upload PST file into Office 365 <\/a><\/strong>with ease, as this software has a simple user interface. Likewise, this makes sure a secure transfer of mailbox data directly to Office 365 without complications. Follow the method to import PST files larger than 50GB to Microsoft 365.\u00a0<\/p>\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Steps_to_Import_PST_File_to_Office_365\"><\/span>Steps to Import PST File to Office 365:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ol>\n<li>First, download the <strong>Aryson Import PST to Office 365 Tool<\/strong>.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2446\" src=\"https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/1.webp\" alt=\"Aryson Import PST to Office 365 Tool\" width=\"844\" height=\"450\" srcset=\"https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/1.webp 844w, https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/1-300x160.webp 300w, https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/1-768x409.webp 768w\" sizes=\"auto, (max-width: 844px) 100vw, 844px\" \/><\/li>\n<li>Then, select the <strong>PST file <\/strong>from your system and click on the <strong>Next<\/strong> button.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2447\" src=\"https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/2-1.webp\" alt=\"select the PST file from your system\" width=\"844\" height=\"450\" srcset=\"https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/2-1.webp 844w, https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/2-1-300x160.webp 300w, https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/2-1-768x409.webp 768w\" sizes=\"auto, (max-width: 844px) 100vw, 844px\" \/><\/li>\n<li>Now, <strong>preview<\/strong> the folders details &gt;&gt; then click on <strong>Next<\/strong> to proceed.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2448\" src=\"https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/3-1.webp\" alt=\"preview the folders details\" width=\"844\" height=\"450\" srcset=\"https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/3-1.webp 844w, https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/3-1-300x160.webp 300w, https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/3-1-768x409.webp 768w\" sizes=\"auto, (max-width: 844px) 100vw, 844px\" \/><\/li>\n<li>Next, click on the <strong>email client<\/strong> and select <strong>Office 365<\/strong>.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2449\" src=\"https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/4-1.webp\" alt=\"select Office 365\" width=\"844\" height=\"450\" srcset=\"https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/4-1.webp 844w, https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/4-1-300x160.webp 300w, https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/4-1-768x409.webp 768w\" sizes=\"auto, (max-width: 844px) 100vw, 844px\" \/><\/li>\n<li>After that, click on <strong>Add Connection<\/strong> &gt;&gt; enter the <strong>Office 365 credentials<\/strong>.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2450\" src=\"https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/5-1.webp\" alt=\"enter the Office 365 credentials\" width=\"844\" height=\"450\" srcset=\"https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/5-1.webp 844w, https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/5-1-300x160.webp 300w, https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/5-1-768x409.webp 768w\" sizes=\"auto, (max-width: 844px) 100vw, 844px\" \/><\/li>\n<li>Thereafter, <strong>map the source PST<\/strong> file to the Office 365 <strong>destination mailbox.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2451\" src=\"https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/6-1.webp\" alt=\"map the source PST file to the Office 365 destination\" width=\"844\" height=\"450\" srcset=\"https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/6-1.webp 844w, https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/6-1-300x160.webp 300w, https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/6-1-768x409.webp 768w\" sizes=\"auto, (max-width: 844px) 100vw, 844px\" \/><\/strong><\/li>\n<li>Afterward, <strong>enable the filters<\/strong> for selective data migration and click on <strong>Start Migration<\/strong>. <img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2452\" src=\"https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/7-1.webp\" alt=\"enable the filters for selective data migration\" width=\"844\" height=\"450\" srcset=\"https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/7-1.webp 844w, https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/7-1-300x160.webp 300w, https:\/\/www.arysontechnologies.com\/updates\/wp-content\/uploads\/2026\/03\/7-1-768x409.webp 768w\" sizes=\"auto, (max-width: 844px) 100vw, 844px\" \/><\/li>\n<\/ol>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Comparison_Manual_Method_Vs_Professional_Software\"><\/span>Comparison: Manual Method Vs Professional Software<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>See the quick comparison before you upload Big PST Files to Office 365.<\/p>\n<table border=\"1\">\n<tbody>\n<tr>\n<td>\n<p><strong>Features<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Manual Method<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Professional Software<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Data Integrity<\/p>\n<\/td>\n<td>\n<p>Risk of data loss or corruption<\/p>\n<\/td>\n<td>\n<p>Maintain complete data integrity<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Time Consumption<\/p>\n<\/td>\n<td>\n<p>Time-consuming, specially fo large files<\/p>\n<\/td>\n<td>\n<p>Fast process with bulk migration<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Folder Structure<\/p>\n<\/td>\n<td>\n<p>May get altered during the process<\/p>\n<\/td>\n<td>\n<p>Preserves original hierarchy<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Bulk Migration\u00a0<\/p>\n<\/td>\n<td>\n<p>Not supported<\/p>\n<\/td>\n<td>\n<p>Supports multiple PST files at once<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Selective Migration<\/p>\n<\/td>\n<td>\n<p>Not available<\/p>\n<\/td>\n<td>\n<p>Available with advanced filters<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Ease of Use<\/p>\n<\/td>\n<td>\n<p>Complex and requires technical steps<\/p>\n<\/td>\n<td>\n<p>Simple and user-friendly interface<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Technical skills required<\/p>\n<\/td>\n<td>\n<p>Moderate to high<\/p>\n<\/td>\n<td>\n<p>Minimal<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Security<\/p>\n<\/td>\n<td>\n<p>Depends on user handling<\/p>\n<\/td>\n<td>\n<p>Secure and reliable migration process<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Common_Errors_When_Users_Import_Large_PST_to_Office_365\"><\/span>Common Errors When Users Import Large PST to Office 365<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Office 365 enforces restrictions on mailbox and upload sizes. PST files that are too large may fail to import.<\/li>\n<li>Slow or unstable network connections can cause the upload to stop or result in incomplete migration.<\/li>\n<li>If the PST file is corrupted, Office 365 cannot read it, and the import will fail.<\/li>\n<li>When you import the large PST files manually, the original folder structure can get disrupted.<\/li>\n<li>Furthermore, incorrect credentials can prevent a successful connection and PST upload.<\/li>\n<\/ul>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When an individual tries to import a large PST to Office 365 it seems difficult when handled manually, often leading to slow uploads, data loss, or broken folder structures. Using professional tools like Aryson Import PST to Office 365 simplifies the process, allowing secure, fast, and accurate migration of even very large files. By splitting oversized PSTs, ensuring a stable internet, and applying selective migration filters, users can optimize performance and maintain data integrity. Whether for a single mailbox or multiple accounts, following these best practices ensures a smooth and hassle-free transfer of large PST files to Office 365.<\/p>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1774960169756\"><strong class=\"schema-faq-question\"><strong>Q1. Can I import PST Files larger than 50GB to Office 365?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans.<\/strong> Yes, but importing such large files directly can be difficult. You may face errors or performance issues. It\u2019s usually better to split the PST file into smaller parts or use a reliable tool to complete the import smoothly.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1774960193976\"><strong class=\"schema-faq-question\"><strong>Q2. What is the safest way to upload big PST files to Office 365?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. The safest approach is to use a trusted automated tool or Microsoft\u2019s network upload method. These options reduce the risk of data loss and handle large files more efficiently compared to manual import through Outlook.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1774960212856\"><strong class=\"schema-faq-question\"><strong>Q3. How to handle import failures for oversized PST files?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans.<\/strong> If the import fails, try splitting the PST into smaller files, check for corruption, and ensure you have a stable internet connection. You can also retry the process using a different method, like network upload or a professional tool.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1774960228632\"><strong class=\"schema-faq-question\"><strong>Q4. Is splitting PST files necessary for large imports?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans.<\/strong> In many cases, yes. Splitting large PST files helps avoid errors, improves performance, and makes the import process more manageable, especially when dealing with files over 50GB.<\/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;2445&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;2&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 - (2 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;How to Import Large PST Files (50GB+) to Microsoft (Office) 365&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 - (2 votes)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Handling very large PST files, like 50GB or more, can quickly become frustrating, especially when standard methods fail with errors<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/\">Read More<\/a><\/p>\n","protected":false},"author":7,"featured_media":2460,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-2445","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-outlook-error"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Import Large PST Files (50GB+) to Microsoft (Office) 365<\/title>\n<meta name=\"description\" content=\"Explore methods to import large PST files (50GB+) into Microsoft 365 easily. 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He enjoys conducting research and generating information that assists database administrators, businesses, and novices in resolving issues with MS SQL Server, MySQL databases, Cloud Computing, and Microsoft Exchange.","sameAs":["https:\/\/www.linkedin.com\/in\/rohan-wiese-writer\/"],"url":"https:\/\/www.arysontechnologies.com\/updates\/author\/rohanwiese\/"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#faq-question-1774960169756","position":1,"url":"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#faq-question-1774960169756","name":"Q1. Can I import PST Files larger than 50GB to Office 365?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans.<\/strong> Yes, but importing such large files directly can be difficult. You may face errors or performance issues. It\u2019s usually better to split the PST file into smaller parts or use a reliable tool to complete the import smoothly.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#faq-question-1774960193976","position":2,"url":"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#faq-question-1774960193976","name":"Q2. What is the safest way to upload big PST files to Office 365?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans<\/strong>. The safest approach is to use a trusted automated tool or Microsoft\u2019s network upload method. These options reduce the risk of data loss and handle large files more efficiently compared to manual import through Outlook.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#faq-question-1774960212856","position":3,"url":"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#faq-question-1774960212856","name":"Q3. How to handle import failures for oversized PST files?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans.<\/strong> If the import fails, try splitting the PST into smaller files, check for corruption, and ensure you have a stable internet connection. You can also retry the process using a different method, like network upload or a professional tool.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#faq-question-1774960228632","position":4,"url":"https:\/\/www.arysontechnologies.com\/updates\/import-large-pst-to-microsoft-365\/#faq-question-1774960228632","name":"Q4. Is splitting PST files necessary for large imports?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans.<\/strong> In many cases, yes. Splitting large PST files helps avoid errors, improves performance, and makes the import process more manageable, especially when dealing with files over 50GB.","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/www.arysontechnologies.com\/updates\/wp-json\/wp\/v2\/posts\/2445","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.arysontechnologies.com\/updates\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.arysontechnologies.com\/updates\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/updates\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/updates\/wp-json\/wp\/v2\/comments?post=2445"}],"version-history":[{"count":2,"href":"https:\/\/www.arysontechnologies.com\/updates\/wp-json\/wp\/v2\/posts\/2445\/revisions"}],"predecessor-version":[{"id":2459,"href":"https:\/\/www.arysontechnologies.com\/updates\/wp-json\/wp\/v2\/posts\/2445\/revisions\/2459"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/updates\/wp-json\/wp\/v2\/media\/2460"}],"wp:attachment":[{"href":"https:\/\/www.arysontechnologies.com\/updates\/wp-json\/wp\/v2\/media?parent=2445"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/updates\/wp-json\/wp\/v2\/categories?post=2445"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/updates\/wp-json\/wp\/v2\/tags?post=2445"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}