In Hillary Clinton's press conference regarding her private email server, she said that she did it for the 'convenience' of not having to carry two mobile devices around. One for private emails; and, another for State Department business.
The problem with this argument is the National Security Agency (NSA) had already solved the two-mobile-device problem for her boss, Barack Obama. When he came to office, the NSA gave him a Blackberry 8830 that was specifically modified to provide ultrahigh security on outgoing messages. At the same time, it protected the President's Blackberry from being hacked or infected. Thus, he was able to use this single device for both private and Presidential emails. This fact was no secret. It was widely reported in January 2009 when he took office.
So, this begs the question. Why didn't Hillary contact the NSA for a single-device solution like the President's? After all, she too is a Blackberry user. Why, instead, use a possibly unsecured private server and a hackable off-the-shelf device for all her emails? It doesn't make sense. Unless of course, the intent is to hide what you are doing; which many believe was the case.
President Obama gets to keep his BlackBerry - NBC News: http://www.nbcnews.com/id/28780205/ns/technology_and_science-tech_and_gadgets/t/obama-gets-keep-his-blackberry/#.VQCjjy6S-Ng
Infosecurity Europe: President Obama's Blackberry revealed: http://www.infosecurity-magazine.com/news/infosecurity-europe-president-obamas-blackberry/
Hillary: I used one email 'for convenience' .... because I thought it would be easier to carry just one device for my communications: http://www.cnn.com/2015/03/10/politics/hillary-clinton-email-scandal-press-conference/
Convenience? Two weeks ago Clinton said she had both iPhone and Blackberry | WashingtonExaminer.com: http://www.washingtonexaminer.com/article/2561329
Why Clinton's Private Email Server Was Such a Security Failure: http://www.wired.com/2015/03/clintons-email-server-vulnerable/