Washington: After two days of a 'star gazing' holiday in celebration of the Russian Orthodox Christmas, it was back to work for Indian American astronaut Sunita 'Suni' Williams and her two companions at the International Space Station.

Even over the weekend off days, the crew conducted its weekly three-hour station cleaning with flight engineer Williams making rounds servicing laptops. She first performed the regular bi-monthly reboot of a router and file server and the weekly rebooting of all laptops.

 Williams and Commander Mike Lopez-Alegria also continued their weekly food frequency questionnaires, said National Aeronautics and Space Administration (NASA).

Sunday began with a ham radio session by Williams with participants in the Australian Scout Jamboree 2007 at Elmore, Victoria, Australia.

She conducted two more sessions Monday, one with the Sherman Elementary School in Henrietta, New York and the other with the Dilworth Elementary School in San Jose, California.

Russian flight engineer Mikhail Tyurin received a 10-minute VIP call from Patriarch Alexis II of the Russian Orthodox Church Sunday.