I am trying to use subversion on a linux machine, the repository is on a Microsoft sbs2008 server. (I can access the repository from a Microsoft Windows 7 machine.) Can some
Don't mount a subversion repository via a network share, it just won't work reliably.
file:// access is intended for local, single-user access only, particularly testing and debugging. When you want to share the repository you really need to set up a proper server, and it is not nearly as difficult as you might think. Read the section called “Accessing the Repository” for guidelines on choosing and setting up a server. [link]
You need to run an SVN server, as David W notes.