I work at a technical university and I have one mac user who's shared calendar's will not sync. They go to the gray disconnected state and will not longer sync. This happened about a week and a half ago, so I create a new identity and painstakingly moved 20GB of archived mail into mbox format and reimported them into her new identity. 

This held for a week, and now they are disconnected again. Since I cannot delete an re-add the calendars, only remove them from view. How do you propose a force a sync? It took me over 6 hours to everything back up for her and even longer for her to finish re-importing her mail.

What other suggestions can I try since she just called and said the calendars were again disconnected again? Creating a new identity for her is not an option?

Honestly the archived mail is really the issue, our university recently enabled the server side archiving, and OUtlook for Mac would show those folders, then I wouldn't worry about resetting her identity every time she had a problem. However since I can only make a back up of EVERYTHING on the server, not just the folders I choose, so I have to export the folders by drag and drop (since if you export a folder of mail folders, it doesn't export it).

I am open to all suggestions.