The thing I always think when I read articles like this (and this one from the NY Times about Senators & Email [1]) is that they don't use email because they don't have to. They have jobs that come with many assistants & aides who can communicate electornically on their behalf. They started working in these positions before email became the norm for business/professional communication and happen to have had careers that span both eras.

I wonder if these people are the last (or some of the last) people that don't use email to communicate.

1: http://www.nytimes.com/2015/03/12/us/politics/storing-emails...