We are trying to move mailboxes from our on-premise Exchange 2010 SP2 server to Office 365. Through our testing, we have come across a few mailboxes that have failed due to email messages over the 25 MB limit in Office 365. Does anyone know a way to scan the exchange databases for all users that have email messages that are over 25 MB and save that info to a CSV file which has username, message subject, message folder and date?
I have not been able to find a way to accomplish this task.