Event ID - 8231

Event Id8231
SourceEXCDO
DescriptionCalendar agent failed to determine the primary calendar for mailbox: mailbox name.
Event Information"According to Microsoft:
Explanation :

This event indicates that the Calendaring Agent in Exchange 2000 failed to determine the Primary Mailbox when a delegate tries to create an appointment on behalf of another user (mailbox).This happens if the user who delegated rights over his/her Calendar to another user (called a delegate) did not first create an appointment in his/her Calendar.
User Action :
Log in with the mailbox owners account and create an appointment. These warning will no longer appear in the Application Log. "
Reference LinksCalendar agent failed to determine the primary calendar for mailbox: mailbox name

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