Microsoft yesterday again changed the rules of its better-upgrade-to-Windows 10 game, announcing that some business PCs running the professional editions of Windows 7 and Windows 8.1 would soon begin seeing notifications to migrate to the newest OS.

At the same time, the Redmond, Wash. company belatedly provided instructions to block the Windows 10 upgrade. The timing was not coincidental: Microsoft is historically more accommodating to its commercial customers than it is to consumers when it comes to choices in upgrading and updating software.

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