
For many systems administrators, choosing and managing a VPN system is often quite a headache. Inflexible clients, servers, and protocols often prevent VPN's from being smoothly integrated into an already functioning network. The fact that many VPN clients are installed on users' home computers, well out of the reach of the systems administration team, often means that troubleshooting and upgrading VPN systems is time consuming and a struggle for both admins and users.
Anonymous: yes, it provides its own client for all OSes. I've tested it under Win32 and it works like a charm (both as a NT service or as a standalone application). I never had problems with it.