If you’re one of the tiny contingent still using Windows 10 Mobile, 10 December 2019 is probably a day you’ve been dreading for nearly a year. As announced by Microsoft in January 2019, it’s the end of life date for version 1709 of the OS, which means that November’s Build 15254.597 (KB4522811) was its last ever software update and therefore its last set of security patches.

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