<page_title> MacOS </page_title> <section_title> Release history </section_title> <table> <cell> Mac OS X 10.0 <col_header> Version </col_header> </cell> <cell> Cheetah <col_header> Codename </col_header> </cell> <cell> March 24, 2001 <col_header> Application support </col_header> </cell> </table>
Mac OS X 10.0 (codenamed Cheetah) was released on March 24, 2001.