They used to do product development but nowadays it's all sales and marketing. The game testers the other commenter is talking about is centralized testing for

They used to do product development but nowadays it's all sales and marketing. The game testers the other commenter is talking about is centralized testing for Microsoft's remaining game studios. It's not very 'posh' either, at least when I was there, quite dated 90s looking offices. I think Microsoft development in general seems to heavily focused in basically the US and India. Exceptions of course, there's acquisitions like Skype and plenty of other examples dotted around but this place is hardly a 'campus' compared to Redmond or IDC.