Hi Darylcheww,
I’d like to confirm if you are using your Office 365 email account on your Outlook for Mac 15.8. If yes, please sign into the online Outlook Web App to view and use your emails as a temporary workaround.
According to your description, the issue that your Outlook crashes is more likely to be related to your local client. Since our forum mainly focuses on Office 365 Online services, we have limited information to handle such client related issues. It is recommended that you contact the specialist Office for Mac Community for effective assistance. Thanks for your understanding.
Best Regards,
Alex