{"id":1474,"date":"2025-04-11T10:12:04","date_gmt":"2025-04-11T10:12:04","guid":{"rendered":"https:\/\/office365solutions.org\/blogs\/?p=1474"},"modified":"2025-04-15T11:59:07","modified_gmt":"2025-04-15T11:59:07","slug":"migrate-exchange-mailboxes-to-office-365-cutover-migration","status":"publish","type":"post","link":"https:\/\/office365solutions.org\/blogs\/migrate-exchange-mailboxes-to-office-365-cutover-migration\/","title":{"rendered":"Migrate Exchange Mailboxes to Office 365 – Cutover Migration"},"content":{"rendered":"

Migrating from Microsoft Exchange to Office 365 is important for businesses as they move to cloud-based solutions. This Exchange Mailbox to Office 365 cutover migration method promises companies more security, flexibility, and collaboration. Certainly, the migration process may seem hard to some organizations, especially when moving a lot of calendar, contact, and email data.<\/span><\/p>\n

In this article, we will learn about the way to migrate mailboxes from Exchange to Office 365 using cutover migration. Also, we discuss the pre-requisites and permission to execute the migration for the organization. Here, we’ll help you make the process smooth, whether it\u2019s small or large.<\/span><\/p>\n

Overview of Office 365 Cutover Migration\u00a0<\/b><\/h2>\n

Cutover migration is a process used to move all mailboxes and data from a Microsoft Exchange to Microsoft 365 in one go. The Cutover migration for Office 365 is suitable for small to medium-sized organizations i.e, less than 2000 mailboxes, and is often used when you want to quickly switch from your local Exchange to Microsoft 365.<\/span><\/p>\n

How Cutover Migration Works:<\/b><\/h2>\n
    \n
  1. Preparation:<\/b>
    \n<\/span> You make sure your Exchange environment is ready. This includes setting up permissions, verifying your domain with Microsoft 365, and preparing users.<\/span>
    \n<\/span><\/li>\n
  2. Start Migration:<\/b>
    \n<\/span>You connect your Microsoft 365 tenant to your on-premises Exchange and begin migrating all mailboxes, contacts, and distribution groups at once.<\/span><\/li>\n
  3. Switch DNS Records:<\/b>
    \n<\/span> After all data is copied, you update your domain\u2019s DNS records (like MX records) to point to Microsoft 365, so emails start arriving in the new inboxes.<\/span>
    \n<\/span><\/li>\n
  4. Decommission Exchange:<\/b>
    \n<\/span> Once everything is confirmed to be working, you can remove the old Exchange server if it\u2019s no longer needed.<\/span><\/li>\n<\/ol>\n

    Prerequisites for Office 365 Cutover Migration\u00a0<\/b><\/h3>\n
      \n
    1. Exchange Server Version Compatibility<\/b><\/li>\n<\/ol>\n

      It is important to ensure that the server is up-to-date with the latest patches and service packs. Microsoft Office 365 cutover migration is supported for on-premises Exchange servers running Exchange 2003, 2007, 2010, or 2013. However, if you are using a newer version such as Exchange 2016 or 2019, you should consider hybrid migration instead.<\/span><\/p>\n

        \n
      1. Microsoft 365 Subscription<\/b><\/li>\n<\/ol>\n

        Before starting the process, you must have an active Microsoft 365 account. Also, your domain that you plan to migrate must be added and verified in Office 365<\/span><\/p>\n

          \n
        1. Mailbox Limit<\/b><\/li>\n<\/ol>\n

          Although cutover migration supports up to 2000 mailboxes but Microsoft recommends processing with 150 mailboxes for fast and efficient migration. For larger migrations, it may take a longer time. For better performance, a staged or hybrid migration can be used<\/span><\/p>\n

            \n
          1. Admin Account Permissions<\/b><\/li>\n<\/ol>\n

            The account you use to connect Microsoft 365 to your on-premises Exchange must have full access to all mailboxes. The account must have Exchange admin permissions like Recipient Management and Application Impersonation (if needed).<\/span><\/p>\n

              \n
            1. Outlook Version Compatibility<\/b><\/li>\n<\/ol>\n

              We must ensure that users are running a supported Outlook version, such as Outlook 2013, 2016, 2019, or Microsoft 365 apps. Once the migration is complete, users can now access their mailboxes through Outlook.<\/span><\/p>\n

               <\/p>\n

              Executing the Office 365 Cutover Migration\u00a0 Process<\/b><\/h3>\n

              Step-1: Add the Domain in Office 365 and also verify it<\/b><\/p>\n