I don't feel this is quite a problem, as we usually don't save solution files to SourceControl. Our team divides in HK and China, and both offices are on different subnet (Intensionally seperated by ISA and China office team member cannot surf web other than pre-approved websites). Although we use the same server for VSS database, we access it through different IPs. If we add the whole solution to the sourcesafe, each time when we open the solution file, it complains the VSS server does not exist (because it's on the other end of network).
But if the project file is not compatible, that'd be a problem.