I have a Exchange Server 2003 with 22 mailboxes and we are going to Outlook 365. I just want to make sure the Cutover Migration is what I want to do. There seems to be a couple things I couldn't find answers to.
1) They call it syncing. Is it a true sync? So if mail keeps coming in to the Exchange Server during the migration will that mail be synced to Office 365?
2) On the flip side if mail comes in to Office 365 during the migration will it be synced back to the Exchange Server?
My concern is losing emails during the transition and when to change the MX records. Any help?