The first PocketPC virus has been discovered! At the moment Duts, as it's known, doesn't do any damage and asks the user's permission before spreading, but transmission avenues include email, the web, synchronisation, or bluetooth. And Pandora's box is now open ...
Of course, over here on the Symbian side of the fence, we've had our first virus, Cabir, for over a month now (at the moment it only affects Series 60 phones, not UIQ phones like the P800). Again, the virus is a "proof of concept" non-malicious release which requires user approval to spread itself, and unlike Duts, can only do so via bluetooth.
Both viruses were allegedly created by members of the hacker group known as 29A Labs. I considered the ramifications of linking to 29A, but those of you who are interested could easily find them on the web anyway. Whatever the case may be, if you do decide to have a look at their page make sure you have a look at their 'old news' for a bit of an eye-opener.