Microsoft will automatically download Windows 10 to millions more PCs in a "recommended" Windows update early next year.

The tech giant shows no signs of slowing the rollout of its new operating system, utterly undeterred by the growing public outcry at its pushy attitude.

Windows 10 already appears as a free "optional" update for some Windows 7 and 8.1 systems, and soon this will be widened to all machines running a genuine copy of Win 7 and 8.1.

Then early next year, Windows 10 will become a free "recommended" update – meaning it will be immediately downloaded by any PC or device that automatically installs "important" and "recommended" updates.

Windows 10 will therefore find its way onto potentially millions more machines because Microsoft recommends that people always install "important" and "recommended" updates automatically.

Once the new operating system is fetched, users will be asked if they want to boot into Windows 10.

"We understand you care deeply about what happens with your device," Terry Myerson, Microsoft's Windows supremo, wrote in a blog post on Thursday.

"This is why regardless of your upgrade path – you can choose to upgrade or decline the offer."

But, and there's always a but...

That being said, we would encourage everyone to upgrade because Windows 10 is the best Windows ever – familiar, safer, faster, and full of innovations. After any upgrade, you can easily go back to your prior version of Windows within 31 days if you choose. We do this by keeping a full copy of your previous operating system on your device – including apps and settings – for the first 31 days following your upgrade. At any time during the first 31 days, you can go to “Settings->Update and Security->Recovery and Uninstall Windows 10” to return to your prior version of Windows.

Microsoft is also updating its media creator tool so that it spits out DVD ISOs and USB disk images that can upgrade any 32-bit and 64-bit Home or Pro machine to Windows 10. ®