During a recent Microsoft Office 365 migration, Now Micro’s Cloud Sherpa, Micah Linehan, encountered a tenancy migration where he had to work through reinstalling Exchange on premise. In this particular case, a vase majority of users had previously been created without Exchange. As Micah moved forward and installed Exchanges, the users were directory synchronized; however, a remote user in Exchange was not. He put together the following recommendations and best practices for working through these issues, as he found there were few technical resources (articles, blogs, etc.) out there. Hopefully this post will alleviate some of the confusion and ease any off boarding or tenancy conversion issues within Office 365.