A few days ago, the Mozilla Foundation launched an updated version of the world acclaimed open source e-mail client, Thunderbird. Thunderbird 2 offers, according to Mozilla officials, a higher security level and a better spam filtration system.
The new system gives the common user the ability to mark an existing message with tags, offered in standard by the program or custom made by the user. Equally as important is the ability to get back to a previous message through a click, just like in a browser.