A wiseman once said always keep your old OS / hardware intact when the new OS is on you
Better yet get some old refurbished / 2nd hand el cheapo PC to trial the new OS on
Nothing surer that a software company like MS will be moving heaven and hell to make
old software obsolete.
I read 3rd party security suites are in their sights
Microsoft admits to disabling third-party antivirus code if Win 10 doesn't like it
6/2017
One of the key planks of Kaspersky’s case against Microsoft is that it cut compatibility testing times from two months to six days.
https://www.theregister.co.uk/2017/0...rty_antivirus/
Kaspersky Lab has called off its antitrust complaints after Microsoft agreed to give antivirus (AV) vendors more time to test their products with new Windows 10 updates
8/2017
https://www.zdnet.com/article/window...-bury-hatchet/