Windows supported MS-DOS from Windows 1.01 to Windows ME, excluding all verisons of Windows that were built of the NT kernel (e.g. Windows NT: 3.1, 3.5, 3.51, 4.0, 2000, XP, Vista, and 7).
Since Microsoft are going to put in a new UI "Wind" in the next version of Windows, will they keep the Aero UI used in Windows Vista/7. Because what if I get disappointed with the new UI? I might want Aero as an alternative. But, must wait and find out. :p