Just to let you guys know my mail program in windows 10 64 bit closed a few seconds after opening it. After deleting the app and reinstalling and many other solutions I still couldn't get it to work....

I had exactly the same problem, its a secure boot setting, you need to go in to bios, select "boot" then "secure boot", change this from "UEFI" to "other os". This will sort your problem :)