From PC World:
This is all part of Microsoft’s plan, of course. Last October, the company announced that it would reclassify Windows 10 as a “Recommended” update from older versions starting in early 2016, at which point many more users would get the upgrade without explicit permission. That reclassification began on February 1, and auto-upgrades have been rolling out ever since. If complaints are reaching a higher volume now, perhaps it’s because the rollout is getting more aggressive.
The gist of this is that Microsoft is now “upgrading” computers to Windows 10 without the users explicit permission. You need to opt out to prevent the upgrade. In the past you needed to opt in to allow it.
There are two issues with this. First of course is the “How dare you!” response most people feel in response to being forced or tricked into doing something.
The second issue applies to dentistry in particular. Many (way too many) dental applications have not been updated to run properly on Windows 10. That means your machine will secretly update one night and the next day you won’t be able to read a chart or take an x-ray.