We just migrated one of our clients from Merak to Exchange 2007. Most of our users are using Outlook 2003 with a few on 2007. What we did is setup a new profile in Outlook, setup most users to connect to the Exchange server via TCP/IP, with a few connecting RPC over HTTP. We then imported, in the new Exchange mailbox on the workstation, each users pst files. The problem is the store on the Exchange Server appears significantly smaller than the pst files we imported, and when we check a few users mailboxes on Outlook Web Access they are missing some emails. Any idea why this is happening or settings we can check? On a side note, the Exchange server is located in separate AD site and is located offsite. The connection speed to the server site should be fast enough.