Hi RGlide,
Thanks for your update.
I suppose you have used other Exchange services besides Office 365, and now you would like to move emails from that account to Office 365.
If that is the situation, based on my experience, I suggest you use the .PST file to migrate data between two accounts.
For more detailed information, please refer to the link below:
http://help.outlook.com/en-us/140/dd401503%28d=loband%29.aspx?sl=1
Thanks,
Eric Sun