"The recent upgrade to Thunderbird 2.0 marked a nice evolution of the client and while it did not bring a lot of major changes it did include a few much needed tweaks. Between these changes and my general requirement of using as few extensions as possible I have found that Thunderbird does not need many extensions to get it set up properly. There are a few excellent ones out there that everyone should know about.
"Everyone talks about Firefox extensions all the time, but Thunderbird has some great ones as well. Here are the four I have found the most useful..."
