You can download Tenfourbird 38.7 for Mac from our application library for free. Tenfourbird for Mac lies within Communication Tools, more precisely E-mail.
From the developer:
Tenfourbird comes in different tuned versions for specific PowerPC processor families: Tenfourbird G5 Tenfourbird G4 - build 7450 (also for 7440) Tenfourbird G4 - build 7400 (also for 7410) Tenfourbird G3
Tenfourbird is a fast, efficient email always based on the current version of Thunderbird, but unlike the main distribution, Tenfourbird is compatible with OS X 10.4 and 10.5 running on PowerPC processors.
You may want to check out more Mac applications, such as Mail-Grab, Install DockStar or Zimbra Toaster, which might be related to Tenfourbird.