Charles Belov wrote:

My inbox was on the Exchange Server, and the receipts were getting
filed, prior to the problem occurring. However, I don't have any way
to know whether Outlook was in SP2 or Exchange was in Unicode when the
receipts were still getting filed, as I had no reason to check these.

I don't have any good suggestions, it seems. Were I in your shoes, I'd
export all my rules, start Outlook once with the /cleanrules command line
switch, then reimport the rules. If that didn't work, I'd try the same
thing, but with a new mail profile as well.
--
Brian Tillman