SEATTLE (Reuters) - A Microsoft Corp. employee working on the world's largest software maker's search initiative was arrested last week on charges that he stole source code from the AltaVista search engine two years ago, authorities said on Friday. Laurent Chavet, a former AltaVista employee, was charged with accessing the company's computers in 2002 after he was no longer employed by the Web search provider but before he was hired by Microsoft, according to an FBI affidavit in an indictment issued by the U.S. District Court of Northern California. Sunnyvale, California-based AltaVista was bought by online search advertising provider...