Sync Outlook 2010 using two servers, one of them an Exchange server

[george.frazier.73]

I'm trying to use two Outlook 2010 accounts and profiles on two computers and two servers by storing all outlook files on an external hard drive. The problem is that one one server is an Exchange server, the other is an IMAP server. Since Exchange creates an ost file that automatically syncs with the server and IMAP does not, is there a way to transfer all contacts, tasks, and calendar items to my external hard drive, then arrange for the Exchange server to update everything when I connect to it. I am really trying to set it up so I can move seamlessly from the computer that contains the Exchange profile to another computer that only contains an IMAP profile by only moving the external hard drive.