Microsoft Corp.'s satellite map service, released three months after Google Inc.'s competing product, may come too late to reverse a slide in market share for its MSN search engine. Redmond, Washington-based Microsoft's new Internet product lets users zoom in on satellite photos. Google's satellite-maps and other services already helped it double revenue from search advertising in the year ended June 30, while MSN sales rose 2.6 percent in the same period. MSN's market share fell to 11 percent in April from 12 percent last year.
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