If your Outlook emails are organized into multiple folders and you want to read messages that meet certain criteria, create a search folder and then search for a specific type of email to see them all in one list. In this guide, we'll show you how to set up and customize an "All Mail" search folder with Outlook 2019, Outlook 2016, Outlook 2013, Outlook 2010, and Outlook for Microsoft 365.
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To set up a custom smart folder that contains all of your email messages:
Open Outlook and go to Mail. If you prefer to use keyboard shortcuts, press Ctrl+1.
Select the Inbox (or other folder) in the email account or PST file for which you want to create the search folder.