I'm developing an application (WinCE 4.2, CF 1.1) for a customer that is asking about virus protection for the devices. Anyone have any thoughts? Is it required? If so, where should I purchase?

It doesn't appear that McAfee sells any CE products, Symantec has a mobile product that targets Windows Mobile 5 and 6 (won't run on CE 4.2, correct?), and eset has a Windows Mobile product in beta.

Interested in your thoughts/advice, thanks,