Yahoo, Microsoft and AOL Forge Display-Advertising Accord

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Yahoo! Inc., Microsoft Corp. and AOL Inc., the three largest Web portals in the U.S., formed a partnership that lets advertisers buy ad space on the sites using a single exchange.

The agreement is aimed at making the buying process easier and boosting demand for display advertising, such as banner ads, the companies said today in a statement. The new service, which will be offered through Yahoo and Microsoft initially, should be available by early 2012.