I suspect this question is not for the faint of heart. As a matter of fact, no one has been able to come up with a viable answer so I thought this was the place to ask it.
The goal is to keep a calendar on an Exchange Server synchronized with a calendar in a .pst file. They both have internet access but are not on the same LAN.
W2K Server, Exchange 5.5, Outlook 2002 on client desktop
Desktop with W2K Pro, Outlook 2002, POP3 mail
Person 2 is not onsite and originally connected via VPN to the Exchange server. She had a mailbox on our exchange server and simply shared Person 1's calendar. Everyone happy.
One day our internet access went down, well actually for 3 days. This left Person 2 offsite without ability to change her calendar, etc. (yes, could have do it using offline folder and sync'd later but concept was not appreciated) Very powerful person is now very pissed. She says she wants to keep everything on her desktop but still wants to have her calendar synchronized with the Person 1's calendar in the mailbox on the exchange server.
I know about Slipstick, etc. and while they may work eventually, none of them seem to be good solutions.