We are running Exchange 2003 in a Windows Server 2003 AD enviroment.  Since
updating to Office 2007, we cannot assign delegates to the Outlook calendar.  
The message is:
The Delegates settings were not saved correctly. Cannot activate
send-on-behalf-of list. You do not have sufficient permission to perform this
operation on this object.

I have researched and found reference to an obsolete KB article 913807 that
suggests to give the SELF account Read and Write Personal Information
permissions, but this did not help me.    Are there any other work arounds?

I am also going to post this in Exchange Server Miscellaneous.

Thanks!