How Siebel CRM Desktop Sets the Primary Employee of a Calendar Appointment

Siebel CRM Desktop sets the Primary Owned By field of a calendar entry according to the following priority:

Resolves the email address of the native Outlook calendar entry to a Siebel CRM employee. If Siebel CRM Desktop finds an employee record that contains this address, then it sets the meeting organizer of the Outlook Calendar entry as the primary.
If Siebel CRM Desktop does not find an employee that contains this address, then it compares this address with addresses from email accounts in the Outlook profile. If it finds a match, then it returns the employee from the employee object. This situation can occur if the email address that is set for the current employee is not the same as the account address in the native Outlook record for this employee.
If Siebel CRM Desktop does not find a match among the email accounts in the Outlook profile, then no employee is found. In this situation, it sets the primary employee to the value in the Generic Siebel Owner system preference. For more information, see How Siebel CRM Assigns Meeting Organizers.