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Microsoft says EU to blame for the worst IT outage


Up to 8.5 million Windows devices were affected by Friday's IT outage after Crowdstrike's antivirus update went awry.

A 2009 agreement insisted on by the European Commission meant that Microsoft could not make security changes that would have blocked the update from cybersecurity firm Crowdstrike that caused an estimated 8.5 million computers to fail, the Big Tech giant said in comments to the Wall Street Journal newspaper. Thousands of flights were delayed or cancelled, leaving passengers stranded at airports worldwide, the UK's NHS service was affected and contactless payments failed to work. Microsoft has Windows Defender, its in-house alternative to CrowdStrike, but because of the 2009 agreement made to avoid a European competition investigation, had allowed multiple security providers to install software at the kernel level.

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