I think you've got SESI wrong - I doubt there's many(if any) people there that would laugh at the notion. Just the opposite. However, it's a business decision, not a popularity contest…and with many pundits declaring that before this year is out, Linux *on the desktop, not the servers* will outperform sales of OSX, that doesn't bode well. Some say it's already happened. Of course, those are fuzzy numbers.
I doubt it was announced at the meeting - that's a pretty major announcement and I woud think someone would have posted it by now.
But don't blame SESI over this. In fact, I'm a well-known disser of OSX, and on more than one occasion I've had my knuckles playfully rapped by a SESI staffer saying “Yah know, Coldrick, people were dissing Linux years ago just like you're dissing OX now”.

I think part of the problem is that if they had some inkling that significantly large companies were thinking of going OSX(like the big shops alluded to years ago about Linux), then they'd consider it. I doubt this is going to happen, though…larger companies are weary of the notion of implementing new OSes…they just got Linux done, and are still doing it. It's not likely to happen IMHO. I noticed Pixar was organizing a linux birds of a feather meeting this year - they want to discuss wacky ideas like all the various vendors getting together and perhaps hacking up an FX-specific distro of Linux. I doubt that would happen(that's a *big* job!), but it's nice to see.
Anyway, just IMHO, yadda yadda…
Cheers,
J.C.