Some users complaint that after they received owner rights on a calendar (set with Outlook) they couldn't make new appointments. They received the following message "An error occurred when setting schedule permissions. Cannot open the free/busy information. You do not have sufficient permissions to perform this operation on this object. See the folder contact or your system administrator". One user didn’t have this problems. The problem exists in both Outlook 2003 and 2007.
I reproduced the problem by giving me the same rights as the complaining group of users. And I had exactly the same error. I tried starting Outlook with the /cleanfreebusy switch, but this wasn’t a solution.
The user without the problem had one difference. She was AD owner of the mailbox and the other users are owner set within Outlook of the mailbox and calendar. Added the owner rights of the mailbox to my account. Restarted Outlook and all problems are gone.
Other mailboxes don’t have this problem. The only thing we can think of is the “&“ character in the username and display name. We are going to correct this and will try again.
I will keep you posted!
01 November 2007
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