Using Classic Outlook on Windows for personal email, calendar, and contact management
Hello,
Thank you for choosing the Microsoft Community! We are happy to help you.
May I know what type of account do you have Exchange/IMAP/POP? Also, what version of Outlook do you have.
Run Microsoft Support and Recovery Assistant to diagnose your Outlook and fix some issues with it and if the issue persist kind create a new Outlook profile. Create an Outlook profile - Microsoft Support
We look forward to hearing from you. Thank you for your cooperation.
Sincerely,
Simbarashe | Microsoft Community Moderator