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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.
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: