Windows Vista Business edition is designed to meet the desktop and mobile PC needs of small, midsized and enterprise businesses. Small businesses will see PCs running smoothly and more securely, resulting in less reliance on IT support. Larger organizations will see dramatic new infrastructure improvements, enabling IT staff to spend less time on day-to-day PC maintenance.Windows Vista Business has built-in malware protection, hardware failure warnings and sophisticated new backup technology. A new user interface - Windows Aero - and an integrated operating system search make navigation and organization easier. And with better mobile features, you can connect to your business information from your desk home, a WiFi hotspot and mobile devices.
Windows Vista Service Pack 1 (SP1) is the complete set of Windows Vista updates Microsoft has issued over the past year plus additional enhancements to improve your PC experience. SP1 doesn't add new features or require you to learn anything new—it simply makes your PC more reliable, run more smoothly, and even more enjoyable to use. SP1 addresses specific reliability and performance issues, supports new types of hardware, and adds support for several emerging standards.
If you are confused about the different editions, click here to choose the edition of Windows Vista that's right for you. 
