Microsoft “Halo 3″ video game set an opening-day U.S. sales record of $170 million, outdoing any video game or movie debut and giving the company’s entertainment unit a strong boost toward profitability. Alien-shooting fans also surged onto Microsoft’s Xbox Live online service. More than a million members took up virtual arms in “Halo 3″ in the first 20 hours on September 25, the day the game debuted, Microsoft said on Wednesday.

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