To migrate email, you need access to the user mailboxes in your source email system. Common connection limits include client/server total connections, per-user connections, and IP address connections on either the server or the firewall. If you limited the connections to your source email system, it's a good idea to increase them to improve migration performance. The biggest email you can migrate is 35 MB. You can migrate a maximum of 500,000 items from a user's mailbox (emails are migrated from newest to oldest). This type of migration doesn't migrate contacts, calendar items, or tasks. You can only migrate items in a user's inbox or other mail folders. Therefore, Microsoft strongly recommends disabling all MRM and archival policies before attempting any data migration to mailboxes. The result is perceived data loss rather than actual data loss, which makes it much harder to identify actual data loss during any content verification checks. Because of this, any messages that are deleted or moved to archive by these policies will result in the migration process flagging these items as 'missing'. Microsoft's data migration tool is currently unaware of tools enforcing messaging records management (MRM) or archival policies. Here are a few limitations to be aware of: If this option won't work for you, see Ways to migrate email to Microsoft 365 or Office 365 for other options.įor Windows PowerShell steps, see Use PowerShell to perform an IMAP migration to Microsoft 365 or Office 365. Your source email system supports IMAP.Use the Internet Message Access Protocol (IMAP) to migrate email when:

You can migrate the contents of user mailboxes from your source email system to Microsoft 365 or Office 365. That are not yet there in new EAC at Other Features or use Global Search that will help you Other admin centers and remaining ones will soon be migrated to New EAC. While most of the features have been migrated to new EAC, some have been migrated to

Microsoft recommends using the new Exchange Admin Center, if not

Effective from December 2022, the classic Exchange Admin Center will be deprecated for

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