At first, a major version of Windows code-named "Blackcomb" was planned as the successor to Windows XP and Windows Server 2003. Features planned for Black-comb included the Sidebar, an emphasis on looking for data, and an advanced storage system named WinFS. However, a minor release code-named "Longhorn" was announced for 2003, delaying the making of Blackcomb. By the middle of 2003, Longhorn had gotten some of the features meant for Blackcomb. After three major viruses exploited flaws in Windows operating systems within a short time in 2003, Microsoft changed its development priorities, putting some of Longhorn's major development work on hold while they made new service packs for Windows XP and Windows Server 2003. Development of Longhorn was reset in September 2004, and it was renamed to Windows Vista. A number of features were cut from Windows Vista as it was being remade.