I have a few questions for the Exchange GURU's out there. I have migrated all my users from Exchange 2003 to Exchange 365 and I am stuck on what to do with a few of the built in accounts. I cannot migrate the built in Administrator account. I keep getting an error saying there is no account associated even when I went in and verified all the settings. Any suggestions on how to get that account migrated?
Also trying to figure out what to do with the sysadmin and System Attendant accounts.
If anybody has a good walk through on how to decommission the 2003 server it would be greatly appreciated.