I client of mine was getting this error on their Treo linked up to Exchange via ActiveSync. There seems to be all kinds of reasons for this one. One solution I found was to tick off the Calendar, Contacts, and Inbox from sync, and then tick on just the Calendar, or just the Contacts, etc., and try to see if it syncs. Once that works, re-sync each of those folders one at a time.
What worked for me was just going to the command prompt and running:
iisreset
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