Outlook 365 is the Microsoft subscription-enabled app with advanced features to access your emails. If you cannot send or receive emails, then there are chances that Outlook is experiencing problems with connecting to the Exchange server. It is critical to fix the connection error immediately, and in the meantime, the error can be annoying if you are in a hurry to send emails. In such cases, verify the email settings in the Outlook app. Also, check if Outlook is Online. If the problem persists, keep reading the instructions below to overcome the error due to which Outlook 365 cannot connect to the Exchange server.