Whenever anyone on the network tries to use Outlook's Scheduling Assistant to add people to a meeting request, it immediately crashes the software. This happens for every single person on the network, on every computer - except two, are both still running Office 2003. All the others are running 2007 now. The Scheduling Assistant doesn't crash the software on those machines still running 2003.
Another problem I have is that I can't create new mailbox / public folder databases. Whenever I try to do so, it succeeds in "creating" it, but no file is made, and mounting the database fails with the following error:
Exchange is unable to mount the database that you specified. Specified database: <db>; Error code: MapiExceptionCallFailed: Unable to mount database. (hr=0x80004005, ec=-2147467259).
Mounting and unmounting existing databases works no problem.
I think one or more of the databases might be corrupted.