Is DC BlackBerry's last stand?

BlackBerry, in the midst of an incredible downward business spiral, appears to be hanging its hopes on what has been its most reliable customer: the government.

The firm, which has hung its hat on the security of its devices and platforms, has traditionally been the feds’ favorite mobile supplier. It’s that kind of customer that helped grow the company in the first place, CEO Thorsten Heins said. Now, with a renewed focus on its professional and enterprise customers, the company is trying to salvage its most loyal user base — a group that largely includes the federal government.