“In a fascinating example of poor timing, disk images of OS/2 2.0 pre-release level 6.605 from July/September 1991 were missing for over 25 years, only to show up literally one day after after the 25th anniversary of the OS/2 2.0 release,” writes the site OS/2 Museum. An anonymous reader writes:
It’s the last OS/2 2.0 pre-release which didn’t use the Workplace Shell (WPS), but “instead utilized the same old Desktop Manager as OS/2 1.2/1.3, which makes it the closest surviving relative of the Microsoft OS/2 2.0 SDK.” Featuring a 16-bit/32-bit hybrid kernel and a “DOS Window” icon (as well as a few games like Reversi and Klondike Solitaire), “the look and feel was not quite the same as OS/2 1.3 and in fact was a cross between OS/2 1.3 and Windows 3.1.”
The elusive 6.605 pre-release fell between 6.149 and 6.167 — and “It is not known what possessed IBM to assign it a completely out-of-sequence number.”
Read more of this story at Slashdot.