Mobile security specialist, Safeboot, has launched one of the first products that can transparently 
encrypt and decrypt data held on Windows mobile PDAs and smartphones. Data Encryption and Secure Access Control for Windows Mobile is unusual in that it integrates with the device, and requires no user intervention other than a passphrase.
All data – including databases, appointments, and calendars - are scrambled and unscrambled without the user being aware it is happening. In addition, specified data folders and media cards added to the device can also be included in the profile.
Conventional PDA encryption systems usually need to be set up by the user on a device-and-file basis, in the style of a desktop or laptop.
If passphrases are forgotten – likely in a corporate setup – Safeboot has a facility whereby they can be reset via a web-based webHelpdesk tool after passing through a challenge-and-response authentication system. Techworld.com - Windows smartphones get grown-up encryption