Outlook will not open even after AppleCare talked me through re-installing Windows for Mac Office, having tried to go back to an old saved identity).

Excel, Powerpoint and Word all open without a problem. How do I idenitify what is preventing Outlook from opening. ( have all my Contacts and Calendar appointments in Outlook so not able to readily access them).

Applecare says this is a Microsoft issue.....

Everything worked fine until about ten days ago....