If your Outlook 365 won’t open, and you already tried “Quick or Online Repair” from the Control Panel with no luck… See below for the solution.
A lot of people have been having problems with Microsoft Outlook crashing with error 0xc0000005. The problem with Outlook crashing when trying to open it was caused by a bad Microsoft Outlook update, and below shows you how to rollback to a previous version of Microsoft Outlook update that works without any problems.
Run below command as administration.
“C:\Program Files\Common Files\microsoft shared\ClickToRun\OfficeC2RClient.exe” /update user updatetoversion=16.0.12827.20470