Windows 10 is going to be the last major revision of the operating system.
Jerry Nixon, a Microsoft development executive, said in a conference speech this week that Windows 10 would be the "last version" of the dominant desktop software.
"There will be no Windows 11," warned Steve Kleynhans, a research vice-president at analyst firm Gartner who monitors Microsoft.
He said Microsoft had in the past deliberately avoided using the name "Windows 9" and instead chose Windows 10 as a way to signify a break with a past which involved successive stand-alone versions of the operating system.