Users have activated more than 110 million copies of Windows 10 since Microsoft began rolling out the operating system on July 29.
That's the latest claim by company officials, as of October 6.
At Microsoft's Windows 10 devices launch in New York City, Windows and Devices chief Terry Myerson disclosed the updated figure.
On August 29, Microsoft execs said Windows 10 was on more than 75 million devices, which was up from the 14 million figure -- the number of copies activated in the first 24 hours the OS was available.
Back in August, when I asked, Microsoft said it was disclosing the number of Windows 10 copies activated by users, not the number of copies of the OS it had sold into the channel.
Microsoft began making Windows 10 available to Windows 7, 8 and 8.1 users as a free upgrade for consumers and some business customers on July 29. Those who don't qualify for the free upgrade and are not covered by a volume license with Software Assurance can opt to buy Windows 10 Home for $119 and/or Windows 10 Pro for $199.
Microsoft has released Windows 10 for IoT, but still has not made available Windows 10 Mobile, the version of Windows 10 for Windows Phones and small ARM- and Intel-based tablets.
Microsoft officials believe Windows 10 will be installed on one billion devices by 2018, officials said earlier this year.