Location on a H/D of email contacts..

I have the responsibility of maintaining the step-sons computer when he thinks he is an IT person. Which is far from it.
Anyway, his computer stopped working due to a bad M/B. So it was decided to obtain a new computer. It has not arrived yet. But I am trying to get info off the hard drive I took out of the old computer. I have googled where the location of the contacts are on the H/D but with avail. So I need some input place as to the location.
THX

WOW, did this section fall the edge of the earth????????????