Hello Bharathan A,
Good day,
Thank you for posting to Microsoft Community, we are glad to assist you
I understand that your emails are marked as read when scrolling through them in Web Outlook, even if you don't open them.
In the meantime, here are the general steps to change the “Mark as read” behavior in Outlook on the web:
- Click on the Settings Icon in the top right corner (left of your name).
- In the Settings panel that opens, click on “View all Outlook settings” at the bottom.
- In the Settings navigation panel on the left, go to; Mail -> Message handling.
- Set the “Mark as read” option to: Don’t automatically mark items as read.
5. Press the Save****button.
We are looking forward to your response! Thanks for your precious time. Have a nice day!
Best regards,
Eleni | Microsoft Community Moderator