To preface: I know this question has been asked before on this forum and many others, however, I have not been able to find a very concise answer.
I have a client with an on-premises Exchange 2007 (part of SBS Server) server with 12 very active mailboxes. The time has come to migrate them to Office 365. I have the user accounts, licenses, etc. setup on Office 365. I am looking for an automated way to migrate the accounts from the on-premises Exchange 2007 server to Office 365. This is a project I will be doing by myself in a few weekends. Any assistance is greatly appreciated.