P-EncryptMail for Outlook is an add-in for Microsoft Outlook 2000 and up. It allows you to keep your messages and attachments private by using the most secure encryption algorithms.

It is very easy to use, just select the messages and click the Encrypt/Decrypt button, then enter a password. You can also send encrypted e-mail, the end user should know the password, and have a program capable of decrypt P-EncryptMail messages, such as the free P-EncryptMail reader available on the CadabraSoftware website.