Michael Kairys wrote:

I run Outlook on a desktop and laptop. Both are set to save messages
on server. I consider the desktop the "master" and periodically I
want to copy its PST file to the laptop. However when I do, the next
time I receive on the laptop I re-download huge numbers of message
(everything still on the server perhaps?) and end up with a huge
duplicate problem.

What can I do about this?

Nothing. Each PC keeps track on its own of the messages that have been
downloaded and that information is not tied to the PST in any way. I
believe it's kept in the mail profile in the Registry, not it's hard to say
because Microsoft hasn't published that info.
--
Brian Tillman