Microsoft bought ad exchange company AdECN more than two years ago. And unless you’ve been paying very close attention, that’s the last you ever heard of it.

This should finally change next year. People familiar with Microsoft’s plans say the company intends to open the exchange for business in January, which will allow online ad buyers and sellers to match up in real time. That will put it several months behind Google, which opened up its ad exchange in September.

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CEO Carol Bartz explains what Yahoo is getting for its $100 million ad campaign, its first global marketing effort, which was launched today in New York during Advertising Week.

Here’s the rundown of Bartz’s press conference on the branding blowout.

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Google is about to flip the switch on its long-awaited Ad Exchange.

The search giant will reportedly open up its AdX service, which is supposed to bring together ad buyers and sellers the same way a stock market does, within the next two weeks. AdX isn’t a surprise, but it is a big deal.

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Google employs about 20,000 people, and I don’t expect to write a story every time one leaves. That said, here’s another one: Michael Rubenstein, who ran DoubleClick’s Ad Exchange unit and who was overseeing the same project after Google bought his old employer, has left “to pursue another opportunity.”

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I’m a Sprint customer, so the wireless company knows where I live, how to find me online, what kind of phone I have and what I spend each month. And it knows my contract expires at the end of the month. So why isn’t it trying hard to keep me from the clutches of AT&T and its iPhone?

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