This thank you email is given on 12/20/15 following the dems debate on 12/19/2015, 18 days after the San Bernardino radical Islamic terrorist killings of the husbands' co-workers at their Christmas party. A month later the Obama admin asked Apple to unlock the phone and they refused.
http://www.nytimes.com/2016/02/18/technology/apple-timothy-cook-fbi-san-bernardino.html?_r=0
So much for Hillary's principled and nuanced stance resulting in any help from lisa Jackson @ apple who must have been dryly sarcastic in the rest of the email when she discusses apple's cooperation with law enforcement.