Thunderbird 0.4

[Chad R. Kittel]

Mozilla Thunderbird 0.4 has been released.  But there are some actions 
that must take place for people that are UPgrading.  I don't know how 
these should be handled but here is info from the site 
http://www.mozilla.org/projects/thunderbird/release-notes.html.

Upgraders:  DO NOT install Mozilla Thunderbird into a directory 
containing program files from a previous version.  Overwriting files 
from a previous release WILL cause problems.  To re-use the directory of 
a previous install, the directory must be deleted and recreated, 
emptied, moved, or renamed.  You should not file bugs in Bugzilla if you 
choose to ignore this step.

[...]

And probably the more complex part...

Important: If you used a prior version of Thunderbird and installed 
themes OR extensions, you need to do the following or Thunderbird will 
NOT run properly. Find your profile directory.  There should be a sub 
directory called chrome. Remove everything in chrome.  This will not 
affect your mail data or preferences.

They also provide a method to enable the "clicking of url links" in 
Thunderbird to spawn the default browser.  Its a little script, maybe 
that can be added as something optional?