Using classic Outlook for Windows in business environments
Hey, how you doing?
Thank you for contacting us and welcome to the Microsoft Community.
My name is Vitor. I'm an Independent Advisor and I'll be glad to help you today.
Please check the below article related to your issue:
Can't send or receive email in Outlook.com
https://support.microsoft.com/en-us/office/can-...
Check if the suggestions above helped you and tell me if it worked.
Thanks
Vitor S.