The suggestion to hackedit max version number here works for me:       
http://sourceforge.net/forum/forum.php?thread_id=1758037&forum_id=658717

for Thunderbird 2.0.0.9

I put the hacked habu .xpi here:
http://www.dspsrv.com/~jamesc/torture/home/grease/
If you use it your computer might explode of course.

I also had to right-click on toolbar and Customise and add Habu Reporting icon
(moving to new computer).



Habu:
https://addons.mozilla.org/en-US/thunderbird/addon/2672
http://www.cybertopcops.com/tips_tricks-spam-reporting-tips.php


http://sourceforge.net/forum/message.php?msg_id=4367034

1) Download habu-1.8.6.2-tb.xpi 
2) Change .xpi to .zip 
3) Extract install.rdf from .zip and open e.g. in Wordpad 
4) Change line 14 from 
<em:maxVersion>2.0</em:maxVersion> 
to 
<em:maxVersion>2.0.0.*</em:maxVersion> 
5) Change version number at line 27 to something unique, e.g. 
<em:version>1.8.6.2.1</em:version> 
6) Save install.rdf, and add back into .zip replacing original 
7) Change .zip back to .xpi and set file name to match new version number from step 5, e.g. 
habu-1.8.6.2.1-tb.xpi