Microsoft says Gmail is a virus  

It seems that Microsoft has started flagging Gmail as a virus in their virus scanning software Windows Live OneCare. Many people are reporting that every time they open Gmail, a warning is displayed telling the user they are infected with "BAT/BWG.A".
Now, either Gmail is a virus, or Microsoft is generating false positives. Some affected by this "virus" say other anti-virus products do not pick up the infection — to me, this is a bit suspicious.
What do you think about it.