Before revision: The company has had Apple departments in all stores since 1982, and has included "Build Your Own PC" departments, "Knowledge Bars" for service and support , and "Knowledge Theaters" for free classes on weekends since 2007.
After revision: The company has had Apple departments in all stores since 1982, and has included "Build Your Own PC" departments, "Knowledge Bars" for service and support and since 2007.