Step 1: Create an admin account in Rackspace.

Step 2: Grant "Full Access" Permission on Mailboxes/Resources to a new account.

Step 3: Ensure all Distribution Groups have the "Managers" attribute filled in.

Step 4: Ensure all objects are visible in the Global Address List.

Step 5: Find your Rackspace Exchange Server.

Step 6: Sign up for the Office 365 E3 Trial.

Step 7: Create Domains in Office 365.

Step 8: Create Your Migration Endpoint.

Step 9: Create a Migration Batch.

Step 10: Finalize Batch Creation.

Step 11: Plan a time for DNS cutover.

Step 12: Wait for DNS propagation.

Step 13: Perform final sync.

Step 14: Disable Users.

Step 15: Reconfigure Outlook.

I hope this step by step guide for Rackspace to Office 365 migration has helped you!

Regards,

Lewis

Admin

apps4rent | o365cloudexperts