Mac High Sierra not able to open MacMail, iCal for more than 5 seconds I am facing some issue with iCal and Mail Application. As soon I open it closes it self within 5 seconds. 

http://g.recordit.co/8q6iIK6cFS.gif

I have tried following things 

Delete Following files 


com.apple.mail.plist 
com.apple.mail-shared.plist
/Users/users/Library/Mail/V4/MailData/Envelope* 


Reset NVRAM

Start in Safe Mode

However nothing is working.
As long as your clock is displaying the correct local time, resetting NVRAM won't affect Mail or Calendar. I'd suggest being more aggressive in cleaning out of Mail's database files and then re-testing:


delete Mail.app's (~/Library/Mail/) data folder (not just its contents)
re-delete both /Library/Preferences/com.apple.mail.plist &amp; ~/Library/Preferences/com.apple.mail.plist
re-delete ~/Library/Preferences/com.apple.mail-shared.plist (if it was re-created)
re-test