[sdfx]

It seems to be Bing and Bing-related revenue together with ads [1]: "OSD revenue increased primarily as a result of growth in online advertising revenue. Online advertising revenue grew $100 million or 21% to $572 million, reflecting continued growth in search and display advertising revenue"

Xbox related revenue, including Live and Downloads are part of the Entertainment and Devices division.

[1] http://www.microsoft.com/investor/EarningsAndFinancials/Earn...