{"id":163865,"date":"2024-03-12T09:32:51","date_gmt":"2024-03-12T09:32:51","guid":{"rendered":"https:\/\/www.stellarinfo.com\/blog\/?p=163865"},"modified":"2025-11-27T05:54:46","modified_gmt":"2025-11-27T05:54:46","slug":"migrate-exchange-mailboxes-to-exchang-online-with-csv-file","status":"publish","type":"post","link":"https:\/\/www.stellarinfo.com\/blog\/migrate-exchange-mailboxes-to-exchang-online-with-csv-file\/","title":{"rendered":"Migrate Exchange Mailboxes to Exchange Online with CSV File"},"content":{"rendered":"<?xml encoding=\"utf-8\" ?><?xml encoding=\"utf-8\" ?><p>It is a challenging job to migrate mailboxes from local Exchange Server to Exchange Online as it requires moving a large number of mailboxes.&nbsp;However, you can use a comma-separated values (CSV) file for migrating a large number of mailboxes in batches. This CSV file contains the required details of each mailbox. You just need to specify the CSV file when using the <a href=\"https:\/\/www.stellarinfo.com\/blog\/how-to-access-exchange-admin-center\/\" target=\"_blank\" rel=\"noreferrer noopener\">Exchange Admin Center (EAC)<\/a> or the&nbsp;New-MigrationBatch&nbsp;PowerShell cmdlet to create a migration batch.&nbsp;Below, we will be discussing the process to <a href=\"https:\/\/www.stellarinfo.com\/article\/migrate-exchange-to-office365.php\" target=\"_blank\" rel=\"noreferrer noopener\">migrate Exchange Server mailboxes to Exchange Online<\/a> using Comma Separated Values (CSV) file.<\/p><h2 class=\"wp-block-heading\" id=\"how-to-migrate-exchange-mailboxes-to-exchange-online-with-csv-file?\"><strong>How to Migrate Exchange Mailboxes to Exchange Online with CSV File?<\/strong><\/h2><p>You can follow the below process to batch migrate mailboxes from Exchange Server to Exchange Online.<\/p><h3 class=\"wp-block-heading\"><strong>Preparing for the Migration<\/strong><\/h3><p>First, you need to create the CSV file. Here&rsquo;s how:<\/p><ul class=\"wp-block-list\">\n<li>Open the <strong>Exchange Admin Center (EAC)<\/strong> and click on <strong>recipients<\/strong>.<\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"627\" height=\"410\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Open-the-Exchange-Admin-Center-EAC.png\" alt=\"Open the Exchange Admin Center EAC\" class=\"wp-image-163866 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Open-the-Exchange-Admin-Center-EAC.png 627w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Open-the-Exchange-Admin-Center-EAC-300x196.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Open-the-Exchange-Admin-Center-EAC-150x98.png 150w\" sizes=\"auto, (max-width: 627px) 100vw, 627px\" \/><\/figure><ul class=\"wp-block-list\">\n<li>Click on the more options (<strong>&hellip;<\/strong>) button and then click on <strong>Export data to a CSV file<\/strong>.<\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"325\" height=\"211\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Export-data-to-a-CSV-file.png\" alt=\"Export data to a CSV file\" class=\"wp-image-163867 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Export-data-to-a-CSV-file.png 325w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Export-data-to-a-CSV-file-300x195.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Export-data-to-a-CSV-file-150x97.png 150w\" sizes=\"auto, (max-width: 325px) 100vw, 325px\" \/><\/figure><ul class=\"wp-block-list\">\n<li>Select only the <strong>EMAIL ADDRESS<\/strong> option and then click on <strong>Export<\/strong>. This will download the CSV file to the default <strong>Downloads<\/strong> folder. However, you can also choose an alternative location from the prompt.<\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"448\" height=\"147\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/download-the-CSV-file-to-the-default-Downloads-folder.png\" alt=\"download the CSV file to the default Downloads folder\" class=\"wp-image-163868 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/download-the-CSV-file-to-the-default-Downloads-folder.png 448w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/download-the-CSV-file-to-the-default-Downloads-folder-300x98.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/download-the-CSV-file-to-the-default-Downloads-folder-150x49.png 150w\" sizes=\"auto, (max-width: 448px) 100vw, 448px\" \/><\/figure><ul class=\"wp-block-list\">\n<li>Once the CSV file is downloaded, open the file with a notepad and change the <strong>EMAIL<\/strong> <strong>ADDRESS<\/strong> header to <strong>EMAILADDRESS<\/strong> (see the below image). Then, save the file.<\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"239\" height=\"202\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/open-the-file-with-a-notepad-and-change-the-EMAIL-ADDRESS-header-to-EMAILADDRESS.png\" alt=\"open the file with a notepad and change the EMAIL ADDRESS header to EMAILADDRESS\" class=\"wp-image-163869 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/open-the-file-with-a-notepad-and-change-the-EMAIL-ADDRESS-header-to-EMAILADDRESS.png 239w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/open-the-file-with-a-notepad-and-change-the-EMAIL-ADDRESS-header-to-EMAILADDRESS-150x127.png 150w\" sizes=\"auto, (max-width: 239px) 100vw, 239px\" \/><\/figure><blockquote class=\"note_alert\">\n<p><strong><em>Note:<\/em><\/strong><em> You can also remove any mailboxes that you don&rsquo;t want to migrate.<\/em><\/p>\n<\/blockquote><h3 class=\"wp-block-heading\"><strong>Create the Migration Batch<\/strong><\/h3><p>Now, you need to create the migration batch and specify the mailboxes to migrate using the CSV file created above. For this,<\/p><ul class=\"wp-block-list\">\n<li>Open the <strong><a href=\"https:\/\/admin.exchange.microsoft.com\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Exchange Admin Center (EAC)<\/a><\/strong> in the Exchange Online. Once logged in, click on <strong>Migration<\/strong> and <strong>Add<\/strong> <strong>Migration<\/strong> <strong>batch<\/strong>.<\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"573\" height=\"145\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Open-the-Exchange-Admin-Center-EAC-in-the-Exchange-Online.png\" alt=\"Open the Exchange Admin Center EAC in the Exchange Online\" class=\"wp-image-163871 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Open-the-Exchange-Admin-Center-EAC-in-the-Exchange-Online.png 573w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Open-the-Exchange-Admin-Center-EAC-in-the-Exchange-Online-300x76.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Open-the-Exchange-Admin-Center-EAC-in-the-Exchange-Online-150x38.png 150w\" sizes=\"auto, (max-width: 573px) 100vw, 573px\" \/><\/figure><ul class=\"wp-block-list\">\n<li>Enter the name of the migration batch and make sure to select <strong>Migration<\/strong> <strong>to<\/strong> <strong>Exchange<\/strong> <strong>Online<\/strong> as the migration path.<\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"359\" height=\"182\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/select-Migration-to-Exchange-Online-as-the-migration-path.png\" alt=\"select Migration to Exchange Online as the migration path\" class=\"wp-image-163872 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/select-Migration-to-Exchange-Online-as-the-migration-path.png 359w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/select-Migration-to-Exchange-Online-as-the-migration-path-300x152.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/select-Migration-to-Exchange-Online-as-the-migration-path-150x76.png 150w\" sizes=\"auto, (max-width: 359px) 100vw, 359px\" \/><\/figure><ul class=\"wp-block-list\">\n<li>Next, you need to select the migration type. Here, we will be choosing the Remote move migration.<\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"491\" height=\"180\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Choose-the-Remote-move-migration.png\" alt=\"Choose the Remote move migration\" class=\"wp-image-163873 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Choose-the-Remote-move-migration.png 491w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Choose-the-Remote-move-migration-300x110.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/Choose-the-Remote-move-migration-150x55.png 150w\" sizes=\"auto, (max-width: 491px) 100vw, 491px\" \/><\/figure><p>Before the migration process, there are a few things that you need to set up to migrate mailboxes to the cloud.<\/p><p>You need to configure and set up a server with <strong>Entra ID Connect.<\/strong> The users and passwords need to be synchronized with the <strong>Entra ID<\/strong>. Once this is complete, you need to configure the Hybrid Configuration Wizard (HCW) and connect the Exchange Online to the local Exchange Server. Verify the domain on the Office 365 ports and assign the licenses of Office 365 to the users.<\/p><blockquote class=\"note_alert\">\n<p>Read More about <a href=\"https:\/\/www.stellarinfo.com\/article\/testing-new-exchange-hybrid-configuration-office365.php\" target=\"_blank\" rel=\"noreferrer noopener\">Testing a New Exchange Hybrid Configuration with Office 365<\/a>.<\/p>\n<\/blockquote><p>You need to disable the throttling of the EWS in Office 365 when migrating many mailboxes. For this, login to the Microsoft 365 Admin portal and create a <strong>New<\/strong> <strong>service<\/strong> <strong>request<\/strong> in the <strong>Support<\/strong> section.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"265\" height=\"131\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/create-a-New-service-request-in-the-Support-section.png\" alt=\"create a New service request in the Support section\" class=\"wp-image-163874 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/create-a-New-service-request-in-the-Support-section.png 265w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/create-a-New-service-request-in-the-Support-section-150x74.png 150w\" sizes=\"auto, (max-width: 265px) 100vw, 265px\" \/><\/figure><p>In the search field of the Need Help section, search for <strong>EWS<\/strong> <strong>Throttling<\/strong> <strong>Policy<\/strong> <strong>Increase<\/strong>. Then, click on <strong>Run<\/strong> <strong>Tests<\/strong>.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"426\" height=\"323\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/search-for-EWS-Throttling-Policy-Increase.png\" alt=\"search for EWS Throttling Policy Increase\" class=\"wp-image-163875 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/search-for-EWS-Throttling-Policy-Increase.png 426w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/search-for-EWS-Throttling-Policy-Increase-300x227.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/03\/search-for-EWS-Throttling-Policy-Increase-150x114.png 150w\" sizes=\"auto, (max-width: 426px) 100vw, 426px\" \/><\/figure><p>If throttled, you will be notified on the screen. You can select the duration in days.<\/p><p>Once complete, click on <strong>Update<\/strong> <strong>Settings<\/strong>.<\/p><p>If this is not the case, click on <strong>Contact<\/strong> <strong>Support<\/strong> to open a case with Microsoft.<\/p><p>If the above is not done, the migration process will be much slower.<\/p><h3 class=\"wp-block-heading\"><strong>Migrating the Mailboxes<\/strong><\/h3><p>On the Exchange Online Admin Center, click on <strong>Migration<\/strong> and then click on <strong>Add<\/strong> <strong>migration<\/strong> <strong>batch<\/strong>. Enter the name of the migration batch and select the migration path &ndash; <strong>Migration to Exchange Online<\/strong>.<\/p><p>Next, select <strong>Remote<\/strong> <strong>move<\/strong> <strong>migration<\/strong> as the migration type and click <strong>Next<\/strong>. Then, select the migration endpoint (created by the Hybrid Configuration Wizard).<\/p><p>When it comes to selecting the users, click on the <strong>Migrate from CSV file<\/strong> and click <strong>Next<\/strong>. On the next screen, set the Exchange Online tenant in the <strong>Target Delivery domain<\/strong>.<\/p><p>After this is done, you need to select the schedule of the migration batch.<\/p><p>In the migration option in the Exchange Admin Center (EAC) of Exchange Online, you can see the migration job and its status.<\/p><h2 class=\"wp-block-heading\" id=\"to-conclude\">To Conclude<\/h2><p>As you have seen above, migrating mailboxes to Exchange Online from a local Exchange Server requires significant administrative effort, technical expertise, and a lot of time. Moreover, native methods are limited to migrating only user mailboxes.<\/p><p>Alternatively, you can use a specialized <a href=\"https:\/\/www.stellarinfo.com\/exchange-migration.php\">Exchange Migration tool<\/a> designed for seamless and efficient migration, <strong>Stellar Migrator for Exchange<\/strong>. This software simplifies the process of migrating mailboxes and other data from on-premises Exchange Server to Office 365 (Exchange Online) or another live Exchange environment.<\/p><p>It allows you to migrate not just user mailboxes but also archive mailboxes, and public folders. With features such as automatic mailbox mapping between source and destination, detailed migration status reports, priority-based exports for VIP users, and support for parallel migration, it ensures a smooth, reliable, and time-saving experience.<\/p><p>In addition, Stellar Migrator for Exchange provides the flexibility to migrate directly to Exchange Online or to another live Exchange server, with ease and minimal effort.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>It is a challenging job to migrate mailboxes from local Exchange Server&hellip; <a class=\"more-link\" href=\"https:\/\/www.stellarinfo.com\/blog\/migrate-exchange-mailboxes-to-exchang-online-with-csv-file\/\">Continue reading <span class=\"screen-reader-text\">Migrate Exchange Mailboxes to Exchange Online with CSV File<\/span><\/a><\/p>\n","protected":false},"author":17,"featured_media":163925,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2960],"tags":[5740],"class_list":["post-163865","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-migrate-to-office-365","tag-exchange-mailboxes-to-exchange-online","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Migrate Exchange Mailboxes to Exchange Online with CSV File<\/title>\n<meta name=\"description\" content=\"This guide simplifies migrating Exchange mailboxes to Exchange Online using a CSV file. Learn step-by-step instructions for Exchange Migration.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.stellarinfo.com\/blog\/migrate-exchange-mailboxes-to-exchang-online-with-csv-file\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Migrate Exchange Mailboxes to Exchange Online with CSV File\" \/>\n<meta property=\"og:description\" content=\"This guide simplifies migrating Exchange mailboxes to Exchange Online using a CSV file. 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