Workbench 4.0, version 52.1 (Kickstart version 52.2), U-Boot 1.1.1

Release date: December 24, 2006, visit the official website
Announcements: AmigaOS 4.0 (Classic)
Updates: July 18, 2007 | February 23, 2008 (Classic)

Shipped with: Available as upgrade for AmigaOne and PPC-equipped A1200/4000

Media: Kickstart on disk

Major enhancements:

See the non-exhaustive list.

Example diskette(s):

Workbench 1Workbench 2Workbench 3Workbench 4
Boot ScreenBoot Menu 1Boot Menu 2
Hidden messages:
Media Information: One CD-ROM