<page_title> MacOS </page_title> <section_title> Release history </section_title> <table> <cell> OS X 10.9 <col_header> Version </col_header> </cell> <cell> Mavericks <col_header> Codename </col_header> </cell> <cell> October 22, 2013 <col_header> Application support </col_header> </cell> </table>
OS X 10.9 Mavericks was released on October 22, 2013.