Yes, in theory. But a lot of folks have found that "reverting" does not, in fact, restore their system successfully. It's scrambled, or hosed.
Personally, the Win7 installations that I've upgraded to Win10 are all VMs (virtual machines) so I can "roll back" in 5 minutes with a file copy.
I wouldn't upgrade to Win10 on the bare metal of a mission-critical Win7 or Win8.1 computer on a bet. Too many horror stories. Experimentation is for VMs.
I did finally remember yesterday to pop a flash drive in the W7 machine (which has the vast bulk of our photos, videos, music, and documents) and save all that.
I guess W10 will be inevitable for me at some point, but almost certainly in a brand new computer, rather than messing with any of our existing ones.
“Yes, in theory. But a lot of folks have found that “reverting” does not, in fact, restore their system successfully. It’s scrambled, or hosed. “
yes, and I’m one of those folks. AND I figured out why. Unlike a full restore point, only a minimal state of the OS is saved for subsequent possible rollback, namely OS files and the registry.
So if you allow (or get tricked into allowing) the in-place W10 “upgrade” and ANYTHING at all changes regarding user-installed software AFTER the “upgrade”, such as a printer driver upgrade, new version of java or flash, or ANY other change to your software, you’ll be hosed if you attempt a rollback because the restored original registry will then be totally out of sync with your updated/altered programs, pointing to old, usually non-existent, parts of your original program components.
One of the ugliest things about this after rollback is that attempts to re-install your damaged software often fail because the uninstallers of the original software have been damaged and the new software won’t install until the old software has been uninstalled, which is now impossible because the uninstallers won’t work any more.
So, while exhorting you about the ease of trying W10 and then rolling back if you don’t like it, Microsoft has essentially been lying.