I am so deflated by this issue, every time I upgrade Insider preview builds the mail app starts crashing without any error message. This issue is widespread all over the internet yet NOT ONE single fix out there solves my problem, I have tried reinstalling the app, using all the powershell commands to try to re-register, I have tried deleting the caches in the appdata folder I have used DISM all to no avail. There has got to be someone out there that know why this is happening. I'm desperate, please help.