Take a look here, it may help:
http://www.slipstick.com/outlook/sync.htm

"Don Bouchard" wrote in message
...
How does one synchronize data from Outlook 2003 on a Desktop computer and
Outlook 2003 on a laptop? When I travel, I carry my laptop. Before leaving
I copy Outlook.pst from desktop to laptop, and when I first log on with
the laptop, it has to download a couple of hundred email files online. I
though emails were saved in Outlook.pst and emails would be be up to date
on the laptop when the updated Outlook.pst was first opened.