On page 70 of 79 of the migration manual:
“You must use the procedures that are provided by your LOB-application provider to migrate the data within the 21-day grace period that you have to complete the migration process and before you decommission the Source Server.”
Then in task 4 of “Finish Migration” it says to remove the server from the network. So I would expect there to be some conflicts if you dont.
Specifically what apps are you having concerns about? Also how many employees are you talking about? Contact me if you want…