Outlook Express Protector 2.093
Control access to Outlook Express and its e-mail and address data bases with Outlook Express Protector. When it is active, no programs can get access to the files and nobody can steal or spoil your data. When you try to start Outlook Express or open Address Book, the program requests you to enter a password to grant access. If a user does not enter a valid password or cancels the authentication dialog box, OE will not be opened.

Outlook Express Security 2.07
Use Outlook Express Security to control access to Outlook Express and its databases. When it is active, Outlook Express becomes locked and no third-party programs can access its message base files and the address book. As a result, when you try to start Outlook Express, open the address book or access the files, a password will be asked to allow access. If an invalid password is entered, Outlook Express or Address Book will not be opened.

Sentry 2.54
Sentry locks down your computer on demand so it stays secure when you aren't using it. No other programs can be opened, no browser history snooped at, and nobody will be touching your files while you're gone. Sentry even takes messages from people who dropped by while you were away. The program appearance is customizable, and can be quickly deployed to a USB flashdrive, floppy disk, or CD to quickly lock any public workstation you may use.

FileLocker- File Encryption Software 2.1
FileLocker allows you to hide and encrypt your private or sensitive files using 128bit encryption, while providing an easy to use interface. Locked files can be opened quickly and easily within FileLocker.