Microsoft closed my application and required an upgrade, I installed it, it required my KEY which I entered and it stated that it was invalid (The key is less than 2 weeks old).  Everything was working before this, NOW it won't even allow my MAC to shut down.  When I try to contact help it says they are busy..   WHAT can I do ??  The MAC is new and I purchased the Office for MAC at the time I bought the computer.