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Rumor: Steve Ballmer wants to own your phone book?

Shares of the U.K.-based Yell Group rise amid rumors that Microsoft is interested in acquiring its properties, which include the U.S.-based Yellow Book directories.

Microsoft may be interested in acquiring Yell Group, the British-based parent company of directories like the U.K.'s Yellow Pages and the United States' Yellow Book, Reuters reported Tuesday. Yell isn't commenting, but shares of the company stock rose up to 5.4 percent amid the speculation.

Yell's properties do not include the U.S.-based Yellow Pages, which is operated by AT&T. Yell came to fruition with the debut of the British Yellow Pages in 1966, and expanded to the U.S. when it acquired Yellow Book USA for $665 million.