Well, I don't know about the 640KB quote, but he did say that OS/2 (what
was to become Warp 3) had Microsoft's full commitment. (cf "The OS/2
handbook"). At the time he said it, MS was already developing NT and
had not the slightest intention of honoring that statement.
What I also remember is this:
For the developers who paid for the advance copy of the "new OS/2"
(about $3000, IIRC), MS sent out copies of NT 3.1. Under threat of
lawsuit, they relented and refunded the advance payments.
--Chuck