Once an unread email message is opened, it will be removed from the Unread Mail folder automatically.
And all unread email messages are collected into this folder automatically. Now an Unread Mail folder is created and shows in the navigation pane. Step 2: In the New Search Folder dialog box, select and highlight the Unread mail item, and click OK.
In Outlook 2010 / 2013, click the New Search Folder button in the New group on the Folder tab.Step 1: Shift to the Mail view by clicking the Mail in the Navigation Pane. The following guidance will help you collect all unread email messages into an Unread Mail folder, and show the folder in your favorites. Actually you can collect all unread email messages into a favorite folder, making your working conveniently and quickly. Sometimes unread email messages may stay among a number of messages, although the Outlook indicates you the number of unread email messages, such as Inbox (5), you can’t find out them at once. How to add unread mails to favorite folder in Outlook?