She insisted on using her personal BlackBerry for all her email communications, but she wasn’t allowed to take the device into her seventh-floor suite of offices, a secure space known as Mahogany Row.... Her aides and senior officials pushed to find a way to enable her to use the device in the secure area. But their efforts unsettled the diplomatic security bureau, which was worried that foreign intelligence services could hack her BlackBerry and transform it into a listening device....
“The issue here is one of personal comfort,” one of the participants in [a meeting of security, intelligence and technology specialists], Donald Reid, the department’s senior coordinator for security infrastructure, wrote afterward in an email that described Clinton’s inner circle of advisers as “dedicated [BlackBerry] addicts.”
March 28, 2016
The origin of Hillary's email problem: "She hated having to put her BlackBerry into a lockbox before going into her own office."