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Microsoft Corp MSFT.O said it had released a security update for Windows.
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The company released a security alert on Wednesday.
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Most of these machines are running Windows XP, for which Microsoft hasn't released a security patch since April 2014.
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Although Microsoft released a security patch for the flaw earlier this year, many systems have yet to be updated, researchers said.
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Most of these machines are running Windows XP for which Microsoft has not released a security patch since April of 2014.
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Apple has released a security update to its Mac OS X operating system, fixing a number of critical security issues in the software.