Up to 1,500 beta testers may have had files deleted by a bug in Windows 10, all without triggering an examination by Microsoft, according to data from the company.

The bug, which erased user files in the Documents, Pictures, Music and Videos folders, forced Microsoft to take the unprecedented move of pulling the Windows 10 1809 feature upgrade from public distribution. Four days after announcing 1809's release, Microsoft barred access to the upgrade via Windows Update, told those who had installed it to stay off their PCs and warned users who had downloaded but not installed it to trash the disk image.

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