Using Classic Outlook on Windows for personal email, calendar, and contact management
Hi Stacy3581,
You may please try using the Office 365 Support and Recovery Assistant (SaRA) tool that can diagnose the Outlook problems. Please download the tool and run the Support and Recovery Assistant on the affected computer troubleshoot the issue. See: About the Microsoft Support and Recovery Assistant
Regarding this point, we would truly appreciate your kind understanding.
Best regards,
Shyamal