Federal IT managers give their agencies average grades for progress made on mobility and telework, despite a law, a White House strategy and high returns to investment encouraging them to embrace laptops over desktops, according to a survey from Alexandria, Va.-based Mobile Work Exchange. Seventy-seven percent of IT managers said their agency deserved a B or a C grade for its implementation of 2012’s Digital Government Strategy--the White House’s effort to make government data more compatible and accessible from mobile…