This content has been archived. It may no longer be relevant.
At this time, Outlook 2011 for Mac does not support the CalDAV protocol. As a result, you can't sync with services that do support CalDAV, such as MobileMe and Google Calendar.
Apple ended support for MobileMe sync with Outlook in June 2011.
More Information
Note: CalDAV is not supported in Outlook 2010 for Windows either.