Hi flutefish -
Ads with non-user-initiated sound shouldn't be running - if you see this again if you could possibly take a screenshot so I can properly identify the ad it would be a big help. I've run through my networks today and see a few microsoft ads, but I've previewed them each individually just now and (1) none of them have sound and (2) none of them say "Small Business Summit". I did see one that said "Small Business Assurance" - could that be it? But again, there was no sound on the version I saw.