Windows 10 is now running on 200 million devices, according to Microsoft, making it the fastest adopted Microsoft operating system thus far.
Microsoft released Windows 10 as a free download in July and has been heavily pushing existing Windows users to download the new OS since then.
Windows 10 replaced Windows 8, which was released in 2012. In October Microsoft Chief Executive Officer Satya Nadella said 110 million devices were running Windows 10. The OS is now on almost double the number of phones and PCs compared to then.
Much of the growth comes from consumers. But the true measure of success for Microsoft involves corporate adoption. Currently about three-quarters of Microsoft's enterprise customers are testing Windows 10, the company said.
Though enterprises are known for taking their time with software updates, Gartner analyst Steve Kleynhans recently said they're moving faster with Windows 10.
"For enterprises, we expect that implementation will be significantly more rapid than that seen with Windows 7 six years ago," Kleynhans said.
Microsoft is also working with partners in China to boost adoption of the new OS in that country.