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OpenPGP & Enigmail
Install GnuPG on local computer
Windows uses version 1.4.11 as of 10 February 2011 - accept default settings
Install right Enigmail package for your system.
Download the .xpi file to desktop and then use add-ons in Thunderbird and Seamonkey to install the package from the locally-saved file.
After installing, open the OpenPGP Preferences and make sure the GnuPG path is set (/usr/bin/gpg or C:\Program Files (x86)\GNU\GnuPG\gpg.exe) and restart Thunderbird.
Inside Enigmail, import local copy of pubring.gpg and secring.pgp
(Delete any old keys there)
Remember the key passphrase is stored securely elsewhere.
Import other people’s keys from http://pgp.mit.edu/
Test the sending and receiving of encrypted messages.
May want to adjust preferences inside Enigmail.
Useful reference for using keys on Linux: