The Microsoft Windows Vista Business Upgrade Service Pack 1 is designed to meet the needs of business organizations of all sizes. For small businesses, Microsoft Windows Vista Business Upgrade Service Pack 1 will help keep PCs running smoothly and more securely so you will be less reliant on dedicated IT support. For larger organizations, Microsoft Windows Vista Business Upgrade Service Pack 1 provides dramatic new infrastructure improvements, enabling your IT staff to spend less time focused on the day-to-day maintenance of PCs and more time adding strategic value to your organization. You can upgrade from your current edition of Microsoft Windows XP or Windows 2000 (including Windows XP Professional, Windows XP Home, Windows XP Media Center, Windows XP Tablet PC, Windows XP Professional x64, Windows 2000) to a corresponding or better edition of Microsoft Windows Vista by purchasing and installing this upgrade copy of Windows Vista.