PPTP Server for Linux

Virtual Private Networking technology provides the medium to use
the public Internet backbone as an appropriate channel for private
data communications. With encryption and encapsulation technology,
a Virtual Private Network essentially carves out a private
passageway through the Internet.

Previously Microsoft VPN *only* worked with an Windows NT PPTP
server. There is now a GPL’d Linux PPTP server that works with
Windows PPTP clients!

Here’s the link.