According to their statement, was just a mistake but clearly it's a lie. What happened was, them turning their heads away and then, the minute everyone found out, they made a U-turn and decided to continue since they probably thought, there's small demand which clearly isn't the case after all. That sort of mistake, doesn't just happen like that, but that's what they want us to believe. Btw, it's still open for US citizens, so not sure why their not expanding it to other countries as well.
It looks like they just want free publicity from the media, IMO. But still it is a good thing that there is still a big company such as Microsoft that support Bitcoin.