A more appropriate title would be "Business Software Alliance withdraws support for SOPA."
I'm pretty sure most people on HN who know what SOPA is, know who the BSA is, and if not they'd learn it from reading the article.
I don't think its fair to imply that Microsoft or Apple (or any of the other BSA members) supported SOPA, as it seems likely the BSA was engaging in knee jerk support and didn't consult its membership.
I, personally, think the BSA should strongly opposes SOPA because it doesn't represent the interest of its member companies in the long run. But the title given here is just unfair.