To set up a search box,

1) Navigate to the folder ribbon in your outlook application

2) Click new search folder

3) Select a search folder. Outlook comes with a wide variety of premade search folders for many different uses. However if you have another idea in mind it is still possible. At the bottom of the list there is a custom search box field.

If you wish to make a custom search box:

4) Click choose criteria

5) Name your custom box

6) Choose which folders and inboxes should be included

7) Specify your custom criteria

8) There are many many options in this menu for all sorts of ways to filter out emails. For example if you want to have an inbox for emails specifically from outside the company you would select the field, 'from' the condition 'does not contain' and in the value entered '@pickeringtest.com'. This way when an email comes in if the sender has an email address that doesn't contain @pickeringtest.com it will enter the search box.

9) After this make sure to add the criteria to the list. Many criteria can be added to further filter things and added to the list.

10) After this okay all the fields and watch your new search box open up and test to see if the right emails you wanted come up.