OK, now I understand. I think (not absolutely certain, though) that you will actually need to delete and recreate the profile completely, not just replace the service.
I'm not sure it was such a good idea to replace the old server with one of the same name, as any other boxes in your Exchange organisation will start to have orphaned directory entries and issues with addressing, system public folders, replicated address books etc...
That said, you'll want to look into the use of a couple of tools supplied with Outlook, Newprof.exe and Profgen.exe and search TechNet and this BB for examples of how to set up an Outlook profle in our logon script. I would hazard a guess that you can delete the old profile by deleting its registry keys.
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Breaker
