Trend Micro Mobile Security 6.0
the author of this app says:
The wide use and increasing capabilities of smartphones and PDAs introduce security risks to the medium business and enterprises that parallel those for laptop computers. Analysts predict that data-centric mobile devices will become a major target for virus writers, hackers, as well as pose a risk to data confidentiality.
Windows Mobile 5.0, Windows Mobile 6.0, and Windows Mobile 6.1.