Windows 7 Ultimate uses Aero style theme which was also used in Windows Vista.
It was more reliable and efficient for the users as it was faster, with better UI. The Windows 7 Ultimate was the successor of Windows Vista. The OS was officially available for the customers on October 22, 2009, for the first time. Windows 7 Ultimate is one of the most famous OS, with the code name “Blackcomb” or “Vienna”.