Initially he was very resentful. He would 'allow' access to all but a work laptop (which I guess he had to 'clean up' before I got to it!) He too had problems with being made to feel like a child Oh well, whatever!
Now, whilst I think he is a long way off happy about it he offers no resistance and seems surprised when I mention something that I could only know if I looked at his emails.
Honestly though, I realise that it is a false reassurance that I get if I ever do 'snoop'. He could easily have secret accounts or phones. I try not to occupy my time with checking up too often.