Here is how I look at it. The upgrade from Windows XP to Vista will not be that big. I think it will only be slightly more of an upgrade than from 2000 to XP. Other than the new LDDM drivers, I don't see Vista being much more of an upgrade from XP than XP was from 2000.
Now, it seems that Windows NT 3.X to Windows NT 4 was a pretty big upgrade. It was also a huge upgrade from Windows NT 4.0 to Windows 2000.
Now from Windows 9X to the NT based opertaing systems, I wouldn't call that an upgrade, but rather a major, required necessity because Windows 9X was a POS OS!! Windows 9X should have died as quickly as possible as soon as XP came out. However, Windows XP and Windows 2000 deserve to stay around and be supported for a long long long time even after Vista is released and becomes mainstream.The reason for that is because Windows 2000 and Windows XP are still good quality opertaing systems, and not everyone who buys the latest hardware will want to run Vista. But anyone running POS Windows 98/ME should have been forced to upgrade to at least Windows 2000 if they wanted to buy the latest and greatest hardware as far back as 2002.
Now, it seems that Windows NT 3.X to Windows NT 4 was a pretty big upgrade. It was also a huge upgrade from Windows NT 4.0 to Windows 2000.
Now from Windows 9X to the NT based opertaing systems, I wouldn't call that an upgrade, but rather a major, required necessity because Windows 9X was a POS OS!! Windows 9X should have died as quickly as possible as soon as XP came out. However, Windows XP and Windows 2000 deserve to stay around and be supported for a long long long time even after Vista is released and becomes mainstream.The reason for that is because Windows 2000 and Windows XP are still good quality opertaing systems, and not everyone who buys the latest hardware will want to run Vista. But anyone running POS Windows 98/ME should have been forced to upgrade to at least Windows 2000 if they wanted to buy the latest and greatest hardware as far back as 2002.