Summary
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The boss of the cybersecurity firm responsible for worldwide IT outages admits it could be “some time” before all systems are back up and running
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While the software bug has been fixed, experts say the manual reboot of each affected Microsoft computer will take a huge amount of work
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Thousands of flights have been cancelled, with banking, healthcare and payment systems all affected
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In the UK, GPs have been struggling to access records, pharmacies have been hit and TV channels knocked off air