Hey Tom,
For moving the repository to a new network folder, you can change the project sharing settings (File / Sharing / Sharing Settings on the ribbon bar) to point your working folders to the new repo location. Alternatively, users could re-join the project in the new repo spot, naming either the same or a new working folder.
If you decide to change up version control systems - such as switching to TFS - performing a File / Save As might be necessary to create a new working folder - and then re-share your project with the new system. Using this approach, you would of course lose any change history from your project.
I'm not sure, but TFS or other systems may have the ability to import existing Subversion repositories, which is the system CaseComplete's built-in project sharing uses.