Mobile Viruses

Hi all!! I just recently got a new phone - an HTC touch pro. now, as this is a win mobile device, I inevitably began to wonder about potential viruises, and so I pose the questions:

 

1) Are mobile virusees common?

2) Are the viruses capable of infecting both windows and its mobile partner?

3) Does NIS include definitions for these types of viruses? (that is the mobile ones)

 

THanks a lot!!

 

 

Matt