which is the newest version of OS/2

newbie2004-ga:

Thank you for your question!

The newest version of OS/2 for PC clients is OS/2 Warp 4.0, released
in 1996. See here for a bit of the history behind OS/2:

http://www.os2bbs.com/os2news/OS2Warp.html

IBM also released versions of OS/2 intended for servers, with the
newest version there being OS/2 Warp Server for e-business. This was
released in 1999:

http://toastytech.com/guis/os242.html

While IBM has not released any new versions of the client OS since
1996, nor of the server OS since 1999, they have publicly committed to
providing support for OS/2 Warp through 2006:

http://www-306.ibm.com/software/os/warp/strategy/
http://www-306.ibm.com/software/os/warp/strategy/#ToC_4

This means that they will continue to issue driver updates and tweaks
as required to allow primarily their corporate customers from becoming
dissatisfied and moving away from IBM completely.

I hope this helps!

aht-ga
Google Answers Researcher