Operating system Windows 7 Professional is a version of Windows 7, aimed directly at business users and IT-specialists. It includes all functions that can boast of Home Premium version, and also has a number of significant additions. Among the functions of the OS includes such as joining the domain, control of Group Policy (GP), search for available printers, automatic online backup, Encrypting File System (EFS) and offline folder. OS Windows 7 Professional will be sold as retail, and in new computers.