The first time you use one of the default categories, such as Purple Category, you'll be prompted to give it a more specific name in the Rename Category dialog box.
At first, Outlook categories have unspecific names: Red Category, Orange Category, and so on. Naturally, categories will have the most meaning for you if you give them names that are specific to the type of work you do.
The first time you use one of the default categories, such as the Purple Category, Outlook will prompt you to rename it. You can type a new name for the category in the Name box, as we've shown in the picture.
Having trouble thinking of category names? It may help if you first think about what you have a hard time finding when you look through your e-mail. If you're new to categories, you may want to start with simple, basic groups such as Business and Personal.