"Server Not Found"

[John]

Hi,
I'm running Office XP on a desktop and laptop. On my
desktop, all is well when I VPN into my work's Exhange
computer. However, starting about 1 week ago, my laptop
will not connect to the server. VPN works fine
(seemingly), and all settings for Outlook and the VPN
seem to be identical for the two computers. The dialog
box says "your Microsoft Exchange Server is unavailable."
I have tried Outlook's built-in repair function, but the
results are the same.

Any ideas?