I've been using Eudora since it was at version 1.1 and could fit on a single floppy disk. All of my email has been archived in it since like 1992, and I've managed to pull Eudora mailboxes through four different computer systems and OSes: two PCs (Win 3.1, Win95 - Win2K), and two Macs (thank you CRLF!). I love Eudora, but lately it seems to really be diminishing in quality for me - malformed HTML email (sending and receiving), Mac incompatibilities with file types and sending to PCs, hideous GUI, the list goes on... So, I've only heard wonderful things about Mail and Thunderbird - and uncovered a few old comparison threads: here, here, and here. In 2005, with Mail on Tiger and Thunderbird at 1.0.6, how do they stack up against each other? Both are based on open standards - is one better than the other in this area? Does one manage massive quantities of email better than the other? What do y'all think - who out there has used both, which do you prefer, and why? Kind thanks!