Utilize the input text as a context reference, choose the right relationship between Bing and Microsoft from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

News releases also appear on global portals and search engines such as AOL, Bing news from Microsoft (NASDAQ: MSFT), Google (NASDAQ: GOOG), Yahoo search (NASDAQ: YHOO) just to name a few.

Answer: operator