Who has tried all of them?

Here is the complete upgrade process, that’s followed:
MS-DOS 5 > Windows 1 > Windows 2 > Windows 3 > Windows 3.1 > Windows 95 > Windows 98 > Windows 98 SE > Windows 2000 (NT!!) > Windows XP SP2 > Windows Vista > Windows 7.

Windows ME isn’t included as its upgrade is mutually exclusive with Windows 2000.