If your emails show up as read, but you haven’t actually opened them in Outlook for Exchange, here are some steps to help you troubleshoot the issue:

1. Check if the 'mark as read' feature has been accidentally enabled in your Outlook settings.
2. See if the same issue is occurring with all the emails, including those from your contacts, or with just certain emails (e.g. from a certain sender).
3. Check if the issue occurs in all devices, including the desktop version of Outlook.
4. See if the emails are showing up as unread when you open them on a web browser.
5. Enable ‘Cached Exchange Mode’ in the Outlook settings.
6. If the above steps do not work, contact your Outlook support team for further advice.