I just encountered a strange problem - at least strange to me. Maybe someone has a solution (or a 'lesson learned'):
I recently imported some eclipse plugin projects into a workspace and wanted to put this work under version control. But this wasn't possible for three out of seven projects: the Team->Share context menu item just didn't show up. I've manually removed all traces of previous SCM systems (cvs, mercurial) and checked if any of the projects had linked resources (there aren't any).
So my question is: does anybody know some (hidden) preconditions to enable team sharing for (plugin) projects?
Edit
After checking again - I didn't 'import the plugins' but I had zipped up the complete workspace and reused it in a different environment (different machine, different eclipse installation). Lessons learned: bad idea.