Get-MigrationBatch -IncludeReport -DiagnosticInfo "showtimeslots, showtimeline, verbose" | Export-Clixml C:\temp\EXO_All_Batches.xml When troubleshooting failed IMAP migrations, Microsoft support will need at least one of the following XML reports from you: This is how you would create the Migration Batch via Exchange Admin Center based on a CSV File where you specify the mailboxes you would migrate to: You can optionally exclude folders in the IMAP Migration Batch if you don’t want to migrate specific folders, or if you find yourself in scenarios where we have a corrupted IMAP folder. Similarly, for Hybrid Remote Moves (Full or Minimal Hybrid Configurations), you would have Move Requests created for the users. When you create the migration batch and specify the Office 365 user mailboxes where you will migrate content via IMAP, the migration service will create Migration Users and corresponding Sync Requests for each user you specified in the CSV File. Test-MigrationServerAvailability -Imap -RemoteServer -Port 993 Here are some screenshots from Office 365 Exchange Admin Center that show where to locate and create Migration Endpoints: And this is a PowerShell view of an IMAP Endpoint (from get-migrationendpoint) established with remote IMAP server on port 993 and using SSL: If you have issues with creating the IMAP Endpoint, you can use Test-MigrationServerAvailability command while connected to Exchange Online PowerShell to test IMAP connectivity: Using a graphical user interface: either Exchange Admin Center or Office 365 Admin CenterĮither method you choose, the IMAP migration needs an IMAP Migration Endpoint created first.There are 2 ways to perform an IMAP migration to Office 365: By default, the maximum message size that can be migrated is 35 MB.(Note that we are working on a richer migration experience for G Suite to Exchange Online migrations, as mentioned here.) You can't migrate contacts, calendar items, or tasks. Only items in a user's inbox or other mail folders can be migrated.Here are some considerations that you need to take into the account when you perform an IMAP Migration:
More about Minimal and Express Migrations can be found here. Managing Exchange Online Mailboxes from Exchange 2007 or Exchange 2003 servers after mailbox migration is not supported.
This is due to directory synchronization which requires administration of Exchange Online Mail Attributes from on-premises Exchange for your synced users. The Minimal HCW will also allow you to be in a supported scenario when you have Exchange Online Mailboxes and the AD users synced to Azure AD and you will need to manage your Office 365 Mailboxes using on-premises Exchange 2010 / Exchange 2013 Management tools (Exchange Admin Center and Exchange Management Shell).
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This will give you a free Hybrid license and will allow you to perform an MRS migration (this means there is no need to recreate Outlook profiles). The recommended migration method when migrating from these old Exchange Servers when Directory Synchronization is required for your organization is Minimal Hybrid Configuration this requires inserting an Exchange 2010 (for Exchange 2003 servers) or Exchange 2013 (for Exchange 2007 servers) and running Minimal HCW. We also don’t recommend Staged migration from Exchange 2007 or Exchange 2003 servers if you intend to keep directory synchronization in place after mailbox migration to Office 365. In such scenarios, we recommend using a native migration method (Cutover or Minimal / Express Hybrid).
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