1. Check if the language settings in Outlook mailbox are the correct ones.

2. Make sure that the language is one supported by Outlook.

3. Ensure that the language is set the same for both the mail set up and the actual Outlook app.

4. If the language is set up correctly but still doesn’t show emails properly, try to clear the mail cache.

5. If you are using a third-party mail setup with Outlook, contact the service provider for help.