Synch other mailbox with Blackberry when turning on the delegate rule

Our Secretary had been assigned to look after her boss's calendar and
contact information (thru Outlook 2003 delegate rule). Lately, her
boss bought a Blackberry device (Blackberry 7280) and would like her
to synch the calendar and contact information from her desk.

Is it possible? On my first trial, it end up sychronizing the
Secretary outlook but not her boss outlook.

Thanks