Chances are good that your Inbox collects email messages from many different sources and covering many different topics. You might receive mail from your workplace, your favorite non-profit organizations, friends and family, your children’s schools, and so on. How can you keep all the mail straight so that you can be sure to respond to the ones that are most important? One answer is to categorize mail from senders who matter most to you. You can do this by assigning a color category to messages so that you can see at a glance which ones are the most pressing items in your Inbox.
On the Home tab, in the Tags group, click Categorize.
Choose All Categories.
The Add New Category dialog ...