Microsoft on Thursday said that 800 million devices are now running Windows 10, a 100 million increase in less than six months.

"Thank you to all our customers and partners for helping us achieve 800 million #Windows10 devices and the highest customer satisfaction in the history of Windows," Yusif Mehdi, a Microsoft vice president, tweeted.

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Microsoft has regularly touted numbers for Windows 10, most of the time, although not always, by citing the active monthly devices, or those personal computers, tablets and other systems used within the last month. Mehdi did not say when the 800 million mark was reached.

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