Some 85 million iPads have been sold since it debuted in April 2010. Recently, , boosting its market share of units shipped to almost 70 percent, according to market researcher IDC.

Rosy numbers aside, the iPad still has a long way to go, says Doll.

"There's this perception that everybody and their grandmother owns an iPad, and it's just not true," he says. "It's actually a fairly small percentage of the total households of our workforce."

Doll doesn't know exactly how many of the city's employees have personal iPads, but he does know that only a few wanted to hook up personal iPads to the corporate network. Doll's iPad push in January included a bring-your-own-device, or BYOD, option. Roughly half of the 170 iPads fell under the BYOD program.