Let us fix your issue Support and Recovery Assistant for Office 365 | Need more help? Contact support for business products - Admin Help. |
Run Windows Update | If your Outlook client software or Windows operating system software is out of date, you might have problems sending and receiving email. For Windows Update instructions, see Windows Update: FAQ |
Repair your Outlook profile | An Outlook profile is a set of configuration information that includes your user name, password, and file storage location. To repair your Outlook profile, see Fix your Outlook email connection by repairing your profile. |
Check for service issues | Admin only: If more than one person in your organization is experiencing email problems in Office 365, it could be due to a problem with the service. Go to the Office 365 service health dashboard page (admin sign in required), and check the status of the services under Exchange Online. |