GORDON142  Just as a heads up, if you have any address book contacts with more than two email addresses or think you might have any, stay away from thunderbird. It still after all these years limits you to two emails per contact, unlike basically every other email application in existence. Very irritating.  
(Version 3.0b4)

PROGRAMHAPPY  Developer, can you please add the option to sort all messages in the inbox by EMAIL ADDRESS, not just by "sender"? I run a business, and deal with hundreds of different customers every day. I need to sort by email address! Can you please add an optional "Email" column? You'll be my hero! I'm sure that countless other people would also appreciate this sorting option.

Thank you!  
(Version 3.0b4)

MARK EVERITT  I'm not sure about version 2, but 3 beta allows simple importing of mailboxes. Surely you don't have to be a software nerd just to copy over account details!  
(Version 2.0.0.22)

ROBERTCOOGAN  A very capable mail app that is very easy to use. It's biggest strength is in it's thrid-party add ons, making it (almost) endlessly customizable.

Only one minor deficiency - great it has the ability to auto-create Gmail accounts now. This is useless however, if you have IMAP Gmail like I do, for it only creates a POP account. Once I set it up (manually) it works great.

On the whole however, it work great, is very stable, and since I have had MAJOR problems getting Apple Mail to savvy with my IMAP Gmail account, the one I use!  
(Version 2.0.0.23)

XENOS  i really don't understand neither ppl ranting about this and that, nor developers concerned about minor geeky things but NOBODY ever has been giving a sign of discontent about the fact that this application not supporting system services is NO MAC APPLICATION. period.

i'm using it nevertheless, 'cause i'm crazy.  
(Version 2.0.0.23)

MAC MAIL  This version 2.0.0.22 was created June 5, 2009. What's new with today's v2.0.0.22? Is it what they call it as RI (reissue)?

What's up???  
(Version 2.0.0.22)

PENGUIRL  Looking for a separate e-mail client for my work account I decided to try Thunderbird again. It's been a few years since the last time I used it and not much has changed. Still unable to import anything at all at launch, and Thunderbird still uses far too much of the CPU. 11% +/- 1% at idle on my DP G5 2.0GHz. Might be okay for some, but being a dedicated BOINC cruncher I am not going to throw away my CPU cycles on an idle e-mail client.

I can't get Mulberry to play nice with gmail, so it's back to Correo for now. Maybe in another decade Thunderbird or Eudora will be ready for prime time.  
(Version 2.0.0.17)

ZX81  I use Thunderbird as a "second" mail app. The only thing I can say is that it works but my main complaint is that it is VERY SLOW ; I get the "rolling ball" for about 2 seconds every time I just open a new or even old mail, select the inbox folder, etc.

I'm now looking for another free mail app that integrates SpamSieve. Any suggestion?  
(Version 2.0.0.16)

MAC MAIL  As long as the 'BCC' button (extension) is not updated, I will not use Thunderbird. Just one little button, Thunderbird has not done anything (for Mac) since version 1.0.7

What a disappointment!!!  
(Version 2.0.0.12)

ORDER2  Rev. 22 has severe difficulties deleting big mail attachments like picture files, resulting in application freezes ("beachball of death"). Had to force quit Thunderbird several times. Reverted to Rev. 17, everything's gone back to normal. (Tiger 10.4.11 on PPC G4)  
(Version 2.0.0.22)