If you were expecting an email but never received it, or if new messages are missing in Microsoft Outlook, troubleshooting can help you identify and fix the problem.
10 Tips to Fix Outlook Not Receiving Emails
There are a few reasons why you might not be receiving new emails. Here are some possible causes:
Whether you're using Outlook on your computer or through the Outlook.com website, try these steps one at a time. Test the app after each step to see if the problem is resolved.
Check to see if Outlook is down. If you are not receiving emails on Outlook.com, it could be that Microsoft is having a problem. When this happens, there is really nothing you can do but wait for them to fix it.