What is Thunderbird
From Wikipedia, the free encyclopedia: Mozilla Thunderbird is a free, open source, cross-platform e-mail and news client developed by the Mozilla Foundation. The project strategy is modeled after Mozilla Firefox, a project aimed at creating a web browser. On December 7, 2004, version 1.0 was released, and received over 500,000 downloads in its first three days of release (and 1,000,000 in 10 days). As of 2008, Thunderbird has been downloaded more than 60 million times since 1.0 release.
Setting up your user account
Accessing the Exchange Server through Thunderbird
For calendar support, you will need to install Lightning, a plugin for thunderbird.
To begin setting up Thunderbird ...