Airscanner: Mobile AntiVirus
With the increased wireless connectivity of PDAs and Smartphones comes an increased threat from virus attacks. Save money, time, and data by protecting your valuable Pocket PC now with Airscanner™ Mobile AntiVirus Pro.

Crippin
Crippin was designed to protect confidential files (text documents, spreadsheets, graphics, photographs, etc.) in case a Pocket PC is lost or stolen. It’s been designed to be: quick-and-easy to use; small (minimal executable size); miserly (with respect to storage required both during and after encryption); secure (using RSA encryption).

CryptoCard
CryptoCard allows you to store your sensitive information using encrypted cards in your PDA. In this sense, it's a competitor of eWallet, FlexWallet, CodeWallet and others, all commercial software that many Pocket PC owners are familiar with.

F-Secure FileCrypto
F-Secure FileCrypto for Pocket PC Personal Edition is a file encryption application that provides protection against unwanted data disclosure. With the application, you can create special encrypted folders for storing confidential and personal information. All files stored in the encrypted folders are automatically encrypted when the folders are locked, and sensitive information remains always safe.

HideIt!
This program provides encryption facilities for Windows Powered Devices, allowing the user to encrypt/decrypt files from within the device itself. HideIt! Pro for Windows Powered Devices supports the popular and proven for its efficiency RSA algorithm. An additional algorithm - DES - is also supported, which can be used on top of RSA. The program can be used for free ONLY for personal use.

Mobile Encrypter
Airscanner Mobile Encrypter gives you granular control over encryption/decryption at the individual file and folder levels. Each file can be encrypted/decrypted with its own password.