Using Classic Outlook on Windows for personal email, calendar, and contact management
Hello,
What is the email domain you are having trouble with? (the part after the @ symbol)
Also, please log in to your email account directly through a web browser (like Outlook.live.com) and let me know if the emails are missing there as well, or if they appear in folders like Archive or Deleted Items. This will help determine if it is an account setting or a device sync issue.