It didn't get much of a workout, but Iridium also has one of the world's best computer billing systems, capable of authenticating calls across the globe, handling currency conversions and roaming charges, and settling international accounts on a single bill.

FORBES: McCaw poised to scoop up Iridium

Since deploying a Microsoft Dynamics solution, Computer Aid has cut its billing cycle in half and reduced ERP support costs by 60 percent.

FORBES: Agile Adaptation: Firm Administration For Professional Services

She sits at a computer with a headset on, placing calls and billing calling cards.

CNN: Dressed For Success

One cause is botched computer systems and underwriting, especially at Oxford, which has led to problems with billing and premiums.

ECONOMIST: American health