Trend Micro calls foul over Microsoft offering free AV software via Windows Update

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Microsoft this week began offering U.S. customers its free antivirus program via Windows’ built-in update service, a move one major security firm said may be anticompetitive.

Last Monday, Microsoft started adding Security Essentials to the optional download list seen by U.S. users running Windows XP, Vista, or Windows 7 when they fired up the operating system’s update service. The move followed an Oct. 19 kickoff of a similar program in the U.K…