

If you do not see the Icon option in the list, make sure you have Frequently-used fields selected in the drop-down above the list.

To be honest, it’s not a straight forward solution and you would have to redo & update the search criteria each time when you want to mark as read older emails, date by date. In Outlook 2013, go to the Outlook Search Tools -> Advanced Find -> Advanced -> Define more criteria -> select Date/Time fields, then select the “Received” field to be “on or before” a certain date. You can achieve this result using the Outlook Advanced Search options. How to mark older emails as read with Outlook Such emails are unlikely to be ever read. The solution is to mark as read only those unread emails older than a given period of time, like older than 1 or 2 months. It can be frustrating to keep seeing unread emails in your Inbox, but on the other hand if you mark ALL your emails as read you will likely mark as read recent emails that were supposed to be actually read in the near future.

Let’s say you have an unread email that’s older than 60 days.
