Microsoft Outlook is immediately crashing worldwide when users start the application, with 0xc0000005 errors displayed in the Windows Event Viewer. These crashes started occurring over the last hour, and reports are flooding in from users all over the world. Microsoft 365 Status Twitter account has tweeted that this is being caused by a new update and that they are investigating the issue. Microsoft suggests users use web and mobile clients until the issue is resolved. If you are not receiving this update, please use the steps in the next section to fix the crashes.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-outlook-is-crashing-worldwide-with-0xc0000005-errors-how-to-fix/