I have seen this on 3 different computers. With and without Exchange too...
When I create a new appointment on the calendar and then try to close and
save, the whole program crashes and the appointment is not saved.

I tried reinstalling, repairing, have the latest MS updates for Windows XP
and Office, and have deleted the dat files (extend.dat, frmcache.dat,
outcmd.dat, view.dat). Nothing helps.

Primal scream ----- aaarrrrrgggghhhhhhhh!