I have a problem that´s getting out of hand here. First of all my outlook 2011 crashes quite often and every time recently after it crashes and i reopen, it downloads tons of old mail into my inbox again. This seems to not stop, and sometimes this again will create another crash. On top of this one of my email clients has stopped recieving new emails. I have two ones using the same client only different names, and the other ones works. My friend installed the same outlook at the same time and has no issues. He has snow leopard and i have Lion. Could this be the problem? if so how do i fix it? I have v. 14.0.0

Please help!