Microsoft has revealed that Windows 10 has been installed on 75 million machines since launch.
Yusuf Mehdi, corporate vice president of the Windows and Devices Group, posted the update on Twitter, as well as revealing that 90,000 unique PC or tablet models have upgraded to Windows 10 since launch.
He also said that people appear to be having fun with the Cortana feature, which has been asked to 'tell a joke' over 500,000 times.
Those with Windows 8 machines will need to run the free upgrade to Windows 8.1 before being able to download Windows 10.
Microsoft called the launch of Windows 10 a “new era for Windows” in which devices of all types and sizes run on a single platform.
“Our vision was one platform, one store and one experience that extends across the broadest range of devices from the smallest screens to the largest screens to no screens at all,” said Terry Myerson, vice president of Microsoft's Operating Systems group, in a blog post.
Most owners of Windows devices eligible for an upgrade should be able to run Windows 10 without issue as the minimum system requirements are quite low.
Windows 10 requires a 1GHz processor, at least 1GB of RAM for 32-bit or 2GB for 64-bit, and 16GB of hard drive space for 32-bit or 20GB for 64-bit.
Dell and HP had products running Windows 10 ready to go on 29 July as PC vendors look to Windows 10 to boost new hardware sales.
The most notable change in Windows 10 is the return of the Start menu in a reversion to the more familiar Windows environment that was lost in Windows 8 and 8.1.
Windows 10 also features numerous new features such as Continuum, which allows the system to recognise which type of device is being used to run Windows 10 and adapt its display type accordingly.
Cortana offers voice-enabled search, while the new Hello biometric feature offers enhanced security (shown below), according to Microsoft.
Windows 10 is aimed at the traditional laptop, desktop and tablet markets, but Microsoft has also touted its potential for use in the growing Internet of Things (IoT) market.
Richard Edwards, principal research analyst at Ovum, suggested that this could be one of the most interesting, and important, aspects of Windows 10.
“Microsoft is pinning its future hopes on Windows 10, but this isn’t about recapturing the important mobile operating systems market (it’s pretty much conceded that to Apple and Google). It’s about gaining a strong foothold in the next multi-billion dollar market: the IoT," he said.
"Microsoft was caught wrong-footed when Google harnessed the Linux kernel to produce the Android operating system that now dominates the smartphone market, but this time, with cloud-savvy Nadella at the helm, Microsoft is ready for action," said Edwards.
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