Instructables
Just like how you can change the homepage in any web browser,Mozilla Thunderbird also allows you to choose a webpage to show in the message viewing area when it starts.This could be useful,you could make it show a news website and see the news.Then, when you click a link,Mozilla Thunderbird opens the link in your default web browser.

Thunderbird can be obtained from www.mozillamessaging.com/en-US/thunderbird/all.html
 
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Step 2: Change the Field

Now,erase the URL written in there and change that to something you want.Don't forget the http:// tag.
Example:
http://www.example.com
Then,click OK.This both applies the settings and closes the window.

Step 3: Done

This is so simple,I'll integrate it into some other computer-related instructable I post.Until then,enjoy this Instructable and this simple method.