Hi,
Have you ever configured your email account on any mail application or device, e.g. smart phone?
If you have configured your emails on your phone for example using POP3, you might lose your emails if you haven't chosen to leave a copy on the server.
By the way, please note that here we mainly focus on Office client related question, for
Outlook.com related issue, consider posting in the following dedicated forum. There you should get more professional responses:
https://answers.microsoft.com/en-us/outlook_com/forum/oemail
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
Regards,
Ethan Hua
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