Microsoft is ending support for one of the world’s most popular operating systems on Tuesday, leaving hundreds of millions of people exposed to cyber attacks and data theft.

From 14 October, Microsoft will no longer provide security and feature updates for Windows 10 , despite just over 40 per cent of all Windows users still running the software.

An estimated 5 million people in the UK still use laptops and PCs that run Windows 10, with a recent survey by consumer group Which? suggesting that a quarter of those intend to keep using it after the deadline passes.

Whether Windows 10 users are upgrading or not, security experts have advised them to create a full backup of their data in the event of either a cyber attack, or an issue with their systems upgrade.

Any devices that contin

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