Microsoft has begun rolling out an update to its Windows 10 operating system, hoping to spark enthusiasm for its virtual- and augmented-reality ambitions.

The Windows 10 update became available Tuesday.

Several of Microsoft’s partners — Acer, Dell, HP and Lenovo — are simultaneously launching their first “Windows Mixed Reality” headsets Tuesday. Samsung is also releasing one early next month.

Microsoft is also announcing a new generation of laptops in its Surface line. Two versions of the new Surface Book 2 — one 13.5 inches and the other 15 inches — will go on sale next month.
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