E-mail verzenden, ontvangen en organiseren in Outlook.com
Hello,
If you exceed the free storage limits for OneDrive (5 GB) or Outlook.com (15 GB), you will be unable to send or receive emails.
However, Microsoft does not delete your existing emails when your mailbox is full. Instead, incoming messages will be rejected and bounce back to the sender with a delivery notification that your storage is full. You will need to ask the sender to resend the message after you free up or upgrade your storage.
If emails that were already in your inbox are missing, check the Deleted Items folder and the 'Recover items deleted from this folder' section.
Or check whether you created a rule that might have moved all your incoming emails to another folder.
Also, check your Junk or SPAM email folders.