Outlook Connector for Lotus Notes: Calendar won't synchronize!

I have been using the current version of the Outlook Connector for Lotus
Domino for over a year now without any major problems: E-mail, calendar and
tasks all updated bi-directionally, as expected. About two weeks ago,
however, appointments that I created in Outlook stopped being updated in my
Notes client Calendar. I deleted my .NST file and had Outlook rebuilt a new
one, to no avail. I also installed the Connector on a second computer and
again experienced the same problem. Curiously, I can edit old appointments
(ones that were synchronized with the calendar in the Notes client) in
Outlook and have the changes appear in the Notes Client; I can also create
new items in the Notes client and they ARE automatically synchronized to my
Outlook calendar.

I recall a Windows Update running about the time the problem started to
occur, so I'm guessing that some type of change made during that update has
"broken" the calendar updating.

Any help or guidance on this problem would be greatly appreciated. I may
have to abandon Outlook and return to the Notes client (egad!) unless I can
fix this problem.