Yes! … … Okay, there’s a bit more to it than that. According to Microsoft’s documentation, you can expect permissions applied to a mailbox to migrate when you use the Microsoft’s MRS-based tenant to tenant migration service. As mentioned in the title, this includes FullAccess permissions, SendAs and folder permissions. Notably, Send on Behalf permissions are not migrated. During the preparation steps you need to do for a T2T migration, you set the ExchangeGuid on the target MailUser to the same value as the source mailbox ExchangeGuid.

I recently learned that the name for an Azure Function App cannot be longer than 32 characters. Unfortunately, I learned this the hard way by spending about 24 hours trying to work out what was going on. What makes it worse is that Microsoft does document this here, albeit in a note towards the end of the page. So, what happens if you name a Function App longer than 32 characters?