Thunderbird

This article covers how to configure Enigmail for Thunderbird, and is part of a series in communications security.

This post requires GnuPG to be setup beforehand. See Security for guides to GnuPG.

Installing and Basic Configuration of Enigmail

For anyone with multiple email accounts that they regularly check, being able to view all of the contents of every inbox at one time is a great boon, and is one of the few reasons that email clients are still more worthwhile then the web interface.
To find a way to set up all of your inboxes to be viewable in a single inbox, while still being able to access each one individually when necessary, is described as "Unified" by Thunderbird.
To turn on the Unified inbox:
Go to View >> Folders and select Unified in the list of options under Folders