Do I actually still need Sync Services enabled in Outlook 2011 on OSX Lion?

17. June 2012 · Write a comment · Categories: Outlook for Mac · Tags: , , , , , , ,
I started noticing lots of (read: over 25000!) duplicated calendar events in the last weeks (a few events with up to 2500 copies!) which made Outlook 2011 and my iPhone totally unresponsive.  This was probably the result of having a mixed setup of iCloud / MobileMe / Exchange 2010 / Local calendars etc.

I finally got rid of the duplicates on my Exchange 2010 account  (I used http://www.vaita.com/ODIR.asp  on Outlook 2010 PC) leaving about 900 events, and cleared the local and iCloud/Mobile Me events (so I only have entries in Exchange 2010),  but I'm wondering now if I actually still need to enable Sync Services in Outlook 2011 (I'm running v. 14.2.2 atm), on OSX Lion 10.7.4 at all?

iCal (+Tasks/Reminders) and the Apple Address Book seem to have decent support for Exchange 2010 out of the box (via Apple System Preferences > Mail, Contacts & Calendars), so why should I enable the Sync Services in Outlook 2011 still?  It's a pretty confusing option. 


I decided to reinstall Outlook 2011 and started syncing mail and the de-duplicated calendars again from the Exchange 2010 server (while keeping Sync Services disabled), but now I notice these types of errors showing up for probably the majority of my calendar entries:

ERROR:
An error occurred while updating the calendar event "*TITLE*"
  
DETAILS:
Please delete this event and create a new event.

Error code: -19126


I double checked some events which generated the error, but at first sight they simply look correctly synced in Outlook 2011.  So why these error messages?

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