[Article] Items are not marked as Read automatically when Unread filter is used in Outlook Web App

📌 Note: This article was originally created by Alex Rizeanu MSFT, a valued member on Answers Support Community. It provided meaningful insights and proved helpful to many. We're recreating it here on their behalf to preserve its value and ensure continued access for others.

Technical Level : Intermediate Summary

PROBLEM:

When a Microsoft Office365 user filters messages using the "Unread" filter in Outlook Web App, after reading a message, the message is not automatically marked as read.

Details

CAUSE: 

This is by design. The functionality to mark an Unread message as Read was never implemented when using the Unread filter as otherwise it would remove the message from the list view.

SOLUTION:

Use either right click to "Mark as read" a message or the "Mark as read" shortcut on the top right corner of the message.

Return to Exchange Online support Corner