If you synchronize Microsoft Entourage 2008 contacts with Address Book via MobileMe, events and tasks with iCal via MobileMe, or Entourage notes with MobileMe, you should install the Microsoft Office Update 12.1.2, or later, on all your Macs which sync.
You may also encounter a scenario in which certain contacts, events, notes or tasks may not appear to synchronize.
To make sure the latest Office 2008 update(s) available for your Mac are installed, use Microsoft AutoUpdate for Mac. Simply, open any Office 2008 application and choose Check for Updates from the Help menu to open Microsoft AutoUpdate.