However, some previously announced features such as Win FS were dropped or postponed, and a new software development methodology called the Security Development Lifecycle was incorporated in an effort to address concerns with the security of the Windows codebase, which is programmed in C, C and assembly. The early development stages of Longhorn were generally characterized by incremental improvements and updates to Windows XP.
During this period, Microsoft was fairly quiet about what was being worked on, as their marketing and public relations focus was more strongly focused on Windows XP, and Windows Server 2003, which was released in April 2003.
Faced with ongoing delays and concerns about feature creep, Microsoft announced on 27 August 2004, that it had revised its plans.
For this reason, Longhorn was reset to start work on componentizing the Windows Server 2003 Service Pack 1 codebase, and over time re-incorporating the features that would be intended for an actual operating system release.
In light of this, Microsoft chairman Bill Gates announced in early 2002 a company-wide "Trustworthy Computing initiative", which aimed to incorporate security into every aspect of software development at the company.The name of the lab in which any given build originated is shown as part of the build label, and the date and time of the build follows that.Some builds (such as Beta 1 and Beta 2) only display the build label in the version information dialog (Winver).In some builds of Longhorn, their license agreement said "For the Microsoft product codenamed "Whistler"".Many of Microsoft's developers were also re-tasked to build updates to Windows XP and Windows Server 2003 to strengthen security.Also of note was the conversion of Windows Explorer to being a . Most builds of Longhorn and Vista were identified by a label that was always displayed in the bottom-right corner of the desktop.A typical build label would look like "Longhorn Build 3663. Higher build numbers did not automatically mean that the latest features from every development team at Microsoft was included.The incorporation of the Plex theme made blue the dominant color of the entire application.The Windows XP-style task pane was almost completely replaced with a large horizontal pane that appeared under the toolbars.Vista aimed to increase the level of communication between machines on a home network, using peer-to-peer technology to simplify sharing files and media between computers and devices. NET Framework, allowing software developers to write applications without traditional Windows APIs.Microsoft's primary stated objective with Windows Vista was to improve the state of security in the Windows operating system.