So far this morning I've had 3 users contact me saying that Outlook has
re-sent invitations for meetings that were scheduled in the past.  The one
commonality between these meetings is they're re-occuring, but the
invitations were sent out and accepted months or even years ago.  Now it
appears those same invitations are being sent again.  We run Exchange 2003
and Outlook 2003.  The only difference between yesterday and today is that
the Outlook Timezone Update Tool (kb931667).  Was installed and run (in
silent mode) on all client computers, but it shouldn't cause this behavior
from my reading and testing.