Ask YC: why there arent any GUI version control applications for desktop users?

I am literally in awe that there are no startups that offer an SVN/Git service for users.<p>File check in, check out to local file servers. Roll back versions, offer controls so only one user can "check out" the file at a time.<p>If you factor in the way enterprise markets are booming, and with file servers becoming common place in small offices - isn't it about time someone noted that both Microsoft and Adobe do not support direct writing to network mounts?<p>Its calling for someone to make a lot of money! Have I missed the startup? is someone doing it? Dropbox for enterprise users?