We recently migrated Exchange from 2007 to 2010 and any users that were created after the migration, we are unable to open up their calendar. I have added myself to the Full Access Permission list and am still unable to open up their calendar.
The error we are getting is: "You do not have permission to view this calendar. Do you want to ask User Name to share his or her Calendar with you?"
If I add this users mailbox to my profile, I get the "Cannot expand this folder" error.
We are running Exchange 2010 SP1 (Build 281.15)
Outlook 2007 SP2 (12.0.6545.5004)