We have done a lot of Office 365 Migrations over the past few years. There are two things I tell every customer at the very beginning of a project:
At some point during this project, I will NOT be your favorite person
We WILL come across something unique that is going to require some additional work
And, you know what? I’ve never been wrong! Each Office 365 migration has resulted in finding some quirk – some unexpected technical problem – that we have to get around.