ActiveWin.com has posted on their website an exclusive article saying that they have had inside sources confirm that the version of Windows codenamed Longhorn will be called Windows Vista, Here’s what they had to say:

The official new name for the Longhorn operating system is Microsoft Windows Vista, according to our insider sources. Microsoft Windows Vista is a major upgrade to the Windows operating system and is both an evolutionary and revolutionary step forward in the progression of the Windows platform. More base services than ever are provided to increase developer ability and productivity, as well as enhance the level of rich interactivity, usability, and integration delivered to the end-user.

The Windows NT kernel has been further enhanced to achieve greater levels of security, reliability, and performance. Several platform services and device driver interfaces have moved to (or returned to) user-level, increasing platform resiliency and simplifying extensibility. Rights management technologies and code access security help maintain user data privacy and application and system-level integrity. Next Generation Secure Computing Base (NGSCB), technologies such as Secure Startup utilizes trusted hardware components to further protect end-user data from unauthorized access and ensure system integrity.

Article 1
Article 2
Microsoft Windows e-XPedition