Calendaring agent failed with error code 0x80150856 while deleting appointment.   

Hi all,
I have a porblem in my Mail Server using Exchange 2007 SP1. Yesterday after I restarted service MS Exchange System Attendant, I started receiving an error in Application Log in Mail Server. Error is:
Calendaring agent failed with error code 0x80150856 while deleting appointment, or similar depends whether I add or delete an appointment from any Client. The Appointments are created or deleted without any problem, only this error is written to Application Log.  I googled a bit, and some people writing about Public Folder Database Permissions of System Account. I used EMC of Exchange 2003 only to view permissions, and I realize that both in Mailbox and Public Folder Databases, SYSTEM has only special permissions, not FULL. I don't know whether is OK with Exchange 2007, or if not how to add permissions to a database.

Thank you for any help


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date: Fri, 04 Jan 2008 07:59:39 -0800   author:   Agim