The sources for this build were pulled from the THUNDERBIRD_3_0_1_RELEASE tag.
I've compiled it with gcc-3.3.5, thus, because of a parsing error in the gcc-code
additional patches were necessary. If you're interestes have a look at attachents
https://bug451278.bugzilla.mozilla.org/attachment.cgi?id=334654
and https://bug453705.bugzilla.mozilla.org/attachment.cgi?id=337204
I also applied the patch from Rich Walsh that shows the file handlers again
https://bug516117.bugzilla.mozilla.org/attachment.cgi?id=400229
Therefore, its possible again to choose the file handler for attachments.
Note, I have also integrated the lightning calendar extension, because users
asked for it on several news groups. However, it may be during the start of
thunderbird with your old profile that you get an error message about
the creation of a local calendar. It appears that some database design was changed
which results in that error message. In this case, watch out for
https://bugzilla.mozilla.org/show_bug.cgi?id=529853.
This bug contains an extension that will fix the error. Be sure to right click
on the link to the third visible attachment  "Extension to fix the Problem - v4"
and save the extension "fix-storage-v17-0.4.xpi" to some folder.
(do not use the left mouse button in firefox, it will try to install this extension
in firefox, which will _not_ help). Install the extension with the extension manager
of thunderbird, restart thunderbird, the extension will fix the data base, close
thunderbird, restart it, de-install the extension, restart thunderbird again.
Everything should be fine then.
A number of quirks compared to thunderbird-3.0 were fixed. Please read the official
release notes.
Any problems should be posted to the newsgroup:
news://news.mozilla.org/mozilla.dev.ports.os2
http://groups.google.com/group/mozilla.dev.ports.os2/
Walter