CMM wrote:

However, I do believe it has to do with rules moving messages to
another PST.... which I thought was a problem squashed years and
years ago. It's not like the messages are moving to the moon.... the
PST is right there in the profile. And it's not like the Server
"hanging up" the download should prevent Outlook from saving ID's of
messages it has ALREADY downloaded.

I don't think rules moving the messages has any bearing on whether or not
Outlook remembers what it has downloaded. However, loss of connection
during the send/receive cycle does affect that, since empirically it appears
that storing the UIDL values is close to the last thing Outlook does in the
cycle. Interruption of the cycle for any reason seems to prevent the
recording of the UIDL values.
--
Brian Tillman