I still think Microsoft should provide a case of beer for each admin performing a migration to Office 365.
OK - so I have on-prem Exchange 2013, migrating to O365 E3.
Azure AD Connect is configured, AD from on-prem DC is being replicated to O365 successfully and Exchange 2013 is configured in hybrid mode. I've already moved a handful of accounts to O365 and they are all receiving email successfully and so far so good.
Now the fun part - I have a few mailboxes that aren't associated to a specific user in AD. These mailboxes were created directly from Exchange 2013 GUI. Due to this, they don't even show in my list of available accounts to migrate over.
Am I missing something here?