But in many ways, the thing that cemented Windows XP's status wasn't Windows XP itself: it was the lack of any successor. Microsoft's Longhorn project, an ambitious plan to radically rework Windows, with an all-new set of APIs and a database-like filesystem, was delayed and ultimately abandoned entirely. Windows Vista, a massively scaled back, more conservative release, eventually arrived in 2006, but by this time Windows XP had become so dominant that users, particularly business users, didn't want a new operating system. That Windows Vista had trouble in its early days, thanks to its steeper hardware demands, its polarizing appearance, and display driver issues--mirroring, in many ways, Windows XP's own introduction--just served to entrench Windows XP further. Business users stuck with Windows XP, and Windows Vista struggled to ever make a serious dent in its predecessor's market share, peaking at just 19 percent in the final days before Windows 7's release.