Windows XP+

Windows XP+ is an extension of Windows XP, released on May 6 2002, intended for high-end computers. Many features are same as the original XP, but some are slightly advanced.

History
NeoWhistler decision was made to bridge a gap between Whislter (as Windows XP) and Longhorn (that would later be Vista)

The kernel version would be NT 5.1a, which is compatible with NT 5.2. With third Service Pack, it is compatible with NT 6.0 and some of 6.1

Service Pack 1 was released on June 2 2005, included all of first Service Pack for original Windows XP. Additionally, some of Windows Server 2003 features were backported to XP+, Royale Blue, some features from XP Plus! and Media Center from Windows XP Media Center Edition is also included.

Service Pack 2 was released on December 5 2007,

It also includes DWM and Aero theme, backported from Windows Vista.