Apply conditional formatting to messages in Outlook

In new Outlook for Windows, select the View tab, then select  View settings, then select Mail > Rules.

Select  Add new rule.

Give your rule a name, then select a condition.

Add an action. For example, you can use Categorize to assign a color-coded tag to messages. 

Add an exception, if necessary. Then, if needed, add more conditions and actions.

Click Save to create the rule.