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.