Sometimes building a VPN can be tedious work, especially when firewalls are involved. There are of course ways to build VPNs that can usually traverse a firewall without the need to configure new rules. One of the most common methods is to use a Secure Sockets Layer (SSL)-based VPN, which can be made to operate over standard HTTP ports.
Microsoft's new VPN technology, Secure Socket Tunneling Protocol (SSTP), does exactly that. SSTP is an SSL-based client-to-server VPN tunneling protocol designed to make connectivity much easier.
This new protocol works over standard HTTP ports will be a boon for mobile users and those of us behind restrictive firewalls or proxies.
It's not clear whether there will be XP support for SSTP down the road. However, for mobile Vista users this will be a huge incentive to get the first Service Pack.