Windows 2003 can be configured as a VPN server that uses L2TP with a preshared key.
Windows 7 can be configured to accept incoming VPN connections, presumably using PPTP.
Is there a way to configure Windows 7 to accept incoming L2TP connections? The configuration settings for incoming connections is extremely sparse; I don't see any place to enter a preshared key or specify the protocol to use. Perhaps it is beyond the capabilities of Win 7, but I hold out hope that I'm overlooking some Group Policy settings or registry edits that allow it.