I have been sharing a calendar with two co-workers for about six weeks. One co-worker started having problems with her computer and deleted her OLW account. She then asked me to stop sharing the calendar with her. She then set up her PASSPORT account and the error message she was getting went away.
She then went back to her OLW account and reactivated it. She didn't have to set it up from scratch like she did initially.
Here is the problem. When I go back and try to share the calendar with her again, I get the error "connection to the server temporarily unavailable, try again later" I have made several tries over several days and still get this error message.
In the meantime, I am still able to share the calendar with the my other co-worker. I'm even able to share new calendars and files with the other co-worker. I get an error message with the 1st co-worker regardless of what I try to share.