Here is what you will need to do:
Follow the below steps to add search in your Outlook.
1. For a start, go to “File” menu and select “Options”.
2. Then locate and click on “Customize Ribbon”.
3. You will see a vast variety of commands, tabs and ribbons listed in dialog boxes.
What you should do is to select “Tools Tabs” in the field of “Choose Commands
from”. At the same time, in the field of “Customize the Ribbon”, you should select
the “Main Tab”.
4. Next locate and pitch on “Search” in the left side. Later click the “Add” button in
center.
5. Finally click “OK’ to save the customization.
After completing the above steps, you can return to the “Home” page, you could see the “Search” tab in the ribbon. Click the “Search” tab, and you will see all kinds of search options. For instance, if you want to search the messages that you sent to specific recipient, you could click the “To” icon. Then a command – “to:(Recipient Name)” will arise in the search field. You can just type the specific name, replacing “Recipient Name”. After press “Enter”, all specific messages will appear immediately.
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