Not a Mac user, but perhaps the last entries from this thread can help :
Outlook 2011 Mac (beta5); how to sync with Google Calendar?
Firstly you need to sync google calendar and contacts with ical and
'contacts' (apple's product). Then you sync outlook with these. Simply
add a contact in outlook and see it appear in you google contacts and
the same with the calendar.
The way to sync Outlook 2011 is via Mac's built-in apps, Address Book
and iCal, and then create a sync service between Outlook 2011 and the
two. Address Book and iCal connect very nicely to Google Contacts and
Calendar - and do so very reliably. I doubt anyone will create a
sync directly with Outlook 2011 because the Mac OSX architecture
allows for Address Book and iCal to be the primarily sync points for
contacts and calendar.
The problem I have is that sync adds all outlook contact folders. I
have contact folders on Outlook that I want to keep separate, but sync
joins all Outlook folders and puts them in the selected sync folder on
outlook and my apple address book.
I sync Google Calendar with Ical and then I sync I cal with Outlook
2011 for Mac. Any events which I have created in Ical show up in
outlook but any events which have been synced into ical from Google
Calendar which show up in ical do not show up in Outlook unless I
change each one to a category of work or home.