University of California President
Napolitano was the Homeland Security secretary before taking over the UC system in 2013.
"I didn't do email. At all," she told reporters at an event on Tuesday outside the Capitol.
She said she didn't send any texts either.
Asked if she avoided emailing and texting because of security concerns, she joked, "It certainly has made my life simpler now."
Clinton has been criticized for using a private email account while serving as secretary of state, rather than using the official government system. She held a news conference Tuesday in New York to defend her communications.