Moving from another system.
WHAT TO ESTABLISH FIRST
What is being migrated: mail, files, or both
How much data From what system What can be left behind
WHAT TO AUDIT
Mailbox sizes File volumes Shared resources and permissions Applications depending on the current system
WHAT TO PLAN
The identity arrangement The domain cutover The sequence and timing Communication to users A fallback
WHAT MIGRATION APPROACHES EXIST
Moving everything at once Moving in stages, with both systems running Moving forward only, leaving history behind
WHAT TO CONSIDER LOCALLY
Upload bandwidth, which determines how long a migration takes.
WHY THAT MATTERS
Large migrations over limited connections take far longer than expected, and must be scheduled accordingly.
WHAT TO TEST
A pilot group, fully, before migrating everyone.
WHAT TO PREPARE FOR USERS
Instructions for reconfiguring devices and mobile applications.
WHAT TO VERIFY AFTER
Mail flow, in both directions Shared resources and permissions Applications that send mail
