I remember his brief relationship with IBM in the late 1970s. That's when he told IBM to stuff it.
I'm not aware that William H. Gates III had any dealings with IBM before his mommy got him the MSDOS gig.
Care to enlighten us on the particulars?
He went from stealing code from the Homebrewers to use in his BASIC for the PDP-10, he tried selling Traf-o-data (a miserable failure), he worked for TRW, Honeywell and he might have worked for one of the other 7 dwarves too.
But he didn't do any work with IBM until his mother who was on the board of the United way with IBM bigshot John Akers, got him a meeting.