Outlook Mac 2011 has crashed

Hi

Can some one please help !!!

I have an iMac, iphone & iPad.

Outlook was working perfectly until Friday evening, we had a power cut !!

Then outlook stopped working on my iMac. Its fine on the other i products.

I have this error message " Microsoft Outlook cannot open be open because of a problem"

Check with the developer to make sure Microsoft Outlook works with this version of OS X.

You may need to reinstall the application.

Be sure to install any available updates for the application and OS X"

I have updated all software and try to re install but with the same problem......any ideas ?

Many thanks...Ruth