June 21st – June 25th Thunderbird Checkins [Latest bug-fixes 1st]
Fixed: 241601 – Address book icon looks like spell check icon in customize dialog [Mail Window Front End]
Fixed: 225158 – Thunderbird should act as an RSS newsreader, too [Mail Window Front End]
Fixed: 247450 – File name have incorrect (base64) encoding when saving message. [Mail Window Front End]
Fixed: 245903 – no system console output in MinGW builds [Build Config]
Fixed: 248073 – Install Extension confirmation dialog should use the new mozapp xpinstall chrome [Mail Window Front End]
Fixed: 247711 – Remove outdated “tbautostretch” XUL attribute from the codebase [Mail Window Front End]

Top critical & blocker bugs:
Since ~19th Aug 03: 215183 – Program freezes when opening large (over 100K) messages
Since ~26th Aug 03: 214342 – Program fails to display folders with large numbers of emails in them(13,000)
Since ~22nd Sep 03: 219372 – The filename of the attachments become wrong with huge email i.e. 271 files – 2.5 Mb
Since ~22nd Sep 03: 219689 – After login, gets stuck at “Getting server configuration info”
Since ~6th Nov 03: 224878 – pop account permanently blocked with hourglass
Since ~19th Apr 04: 240819 – Crash in mail.dll when checking mail
Since ~24th Apr 04: 241609 – [Mac only] crash at 0x00706d68 NSGetModule + 0x2374 when selecting messages in INBOX
Since ~10th May 04: 243167 – Platform-specific en-mac/unix/win.jar localization files not all included for each distribution
Since ~12th May 04: 243442 – [Mac only] Crash on Mac OS X when sending e-mail
Since ~25th May 04: 244601 – Mail inside local mailbox lost after getting mail from POP3 server
Since ~18th June 04: 247552 – When upgrading to 0.7, problems not finding the 0.6 profile on OS X

Interesting bug:
Since ~18th Dec 00: 58612 – Need realtime spellchecking mechanism