Error: "unable to open user's mail database" when trying to open other persons calendar

Hi

We have about 300 users, all the setup’s is alike. But one user is getting the error: “unable to open user’s mail database” when she’s trying to open someone else’s calendar (or calendar entry) from a group calendar.

We’re running Domino 6.5.5FP2, and I’ve just upgraded the user to Notes 7.0.2 - still doesn’t work.

The workaround with placing the users in the workspace is ok, but not for the long term.

Did anyone experience the same ‘problem’ or have any comments on this?

Best regards

Morten