We have Office 365 with one Exchange box.
The user came from an IMAP setup with Outlook 2007.
We uninstalled Office 2007 after backup up all the mail to a PST (which we still have), setup Office 365 with his domain (all verified working correctly), and installed Office 365 on his computer.
We setup a new profile with the Exchange and it works. However, it seems that the Exchange box is "eating" the mail when dragging it up from the open PST file in Outlook to the Exchange folder.
I have checked the AutoArchieve options and they are all off and I have searched his hard drive for archive*.*t on his computer without luck.
What is going on? Where are all of these emails going? We have done this before and dragging them up (from the PST to the Exchange folders) the Exchange server syncs and "absorbs" them if you will and it works automatically.