I have latest version of Apple OSX, (Mavericks) and their office applications and latest version of Office for Mac 2011, including Outlook 2011 version 14.3.9.  For some reason the automatic syncing between Outlook address book and the Apple Contacts app has stopped working since upgraded to latest version of the Apple OSX 10.9.1.
I need to use Outlook in the office environment and have little choice on that.
I use an iphone so especially need iphone address book to be up to date with the MAC version of contacts, which used to sync with Outlook address book.
Apple  forums direct queries to MS forums because functionality stopped working when I upgraded to latest version of OSX, but they seem to imply that proble lies with MS.  Which I feel is a cop out but there we are.  I am caught between 2 giants and cannot get a sensible answer

Can anyone clearly tell me why the sync of 2 address books stopped working, is it an Apple or MS issue to fix, and is there a timeline to fix or a practical alternative to keep these 2 address book/contact applications in sync.

Failing this I will have to drop all MS products from my Mac and go 100% native Apple, but given my many years of MS Office experience this would be a difficult change and a retrograde step.

In advance, many thanks for advise and direction provided