Re Outlook. I keep my Outlook in "My Documents" in my data partition along with word, photos, nusic etc. I then use freefileshnch to make a daily back up. Never had to use the back up but this site seems interesting. I wonder if ther is a hidden back up somewhere? Could you try Recuva to find the lost contacts?
Honor 5X review: Hands-on with the new budget phone from Hauwei's young brand