Mac OS X 10.4 "Tiger" was released in 2005 as the successor to "Panther". It introduced new features like Spotlight search, Dashboard widgets, and was the first version of Mac OS X compatible with Intel processors. Tiger was very successful, with over 2 million copies sold in the first 6 weeks and 67% of Mac users adopting it within 2 years. It remained the primary Mac operating system until the release of "Leopard" in 2007.