[mcguire]

I didn't work for Microsoft, but I don't believe that Windows NT and OS/2 Warp had much significant in common, other than starting as a nominal "OS/2 3.0". The relationship between IBM and MS had fallen apart before 2.0 was released.

[chiph]

Yes, the "OS/2 3.0" was a marketing/naming thing, and was dropped when it became obvious that OS/2 wasn't going anywhere in the market.