Houston we have a problem. We have two options to get our pst info from a previous exchange box. The questions is what is necessary to migrate from on prem exchange box to office 365? Is there a specific file on the server that contains all the data that can easily migrate into office 365? If we can get this, it will probably be the easiest option I imagine.
However, there is a possibility we will run into a snag with the admin. If we are unable to get the admin to give us access to the exchange data, we will only have the users and their passwords. Will there be a way to migrate just with this information?