I have a Windows 2008 SBS server in our office. We just replaced a dead one with this and have RRAS running for remote clients to access our network via PPTP. The clients can access the network Ok - they can do RUN "\\workstationname" or RUN "\\servername" to see shares on different computers and different servers.
The issue is that none of them can browse the network by clicking the Network icon in Windows Explorer. (All machines are Win 7 Pro). I think there's a NETBIOS issue here with the VPN because it works just fine inside the office.