Mursi, the case's top defendant, was ousted by the military in July 2013 and has already been sentenced to death in another case.
Saturday's verdicts can be appealed.
Two Al-Jazeera employees - identified by the judge as news producer Alaa Omar Mohammed and news editor Ibrahim Mohammed Hilal - were among those sentenced in absentia along with Asmaa Al-Khateib, who worked for Rasd, a media network widely suspected of links to Mursi's Muslim Brotherhood.
The Brotherhood was banned and declared a terrorist group after Mursi's ouster.(All Africa)