Outlook Categories: Names, Colors, and How They Work

In Outlook, the default color categories are Red Category, Orange Category, Yellow Category, Green Category, Blue Category, and Purple Category. You can rename these labels, assign them to messages and other Outlook items, and create a personal color-coding system; the names are not fixed topic categories such as Work or Personal.

What the Outlook category names mean

The default names identify colors rather than subjects. In classic Outlook for Windows, the category list commonly starts with the six color-named labels above. Outlook versions and interfaces can differ in how they display category colors and commands, so the exact list you see may vary. The important point is that Outlook categories are customizable labels, not a required set of six meanings.

For example, you could rename Red Category to Urgent, Blue Category to Projects, and Green Category to Waiting for Reply. Or you could leave the color-based names alone and use color as the main cue. A category’s name and color are associated, but you choose what that combination means in your own workflow.

You can also add categories, subject to the options available in your version of Outlook. Thus, if you are asking which categories to use, there is no universal official list of subjects. A person managing invoices might use Finance and Receipts, while someone organizing a busy calendar might prefer Client Meetings and Travel.

What categories do in Outlook

A category is a label attached to an Outlook item. It gives you a way to group related items without moving them out of their existing location. You can use categories on email and, depending on the Outlook app and item type, on calendar events, contacts, and tasks. A message can have more than one category, which is useful when it belongs to several kinds of work at once.

Categories can make a mailbox easier to scan. A colored label beside a message can quickly distinguish, for instance, a project update from a bill that needs attention. You can also search or filter by category in supported Outlook views. This can help you bring together messages from different folders without reorganizing the folders themselves.

Categories are primarily an organizational aid for your Outlook mailbox, not a message feature that you send to other people. Applying a category does not add a visible tag to the email received by its recipient. People who have access to the same mailbox or relevant shared Outlook data may encounter its organization differently, depending on the item and setup, so do not treat a category as a private security control.

How to apply a category

The command names and exact locations change between classic Outlook, new Outlook, and Outlook on the web, but the general process is similar. Select an item, open the Categorize command, and choose a label. In many versions you can categorize an email from the message list or after opening it; calendar items and other Outlook items have their own category controls.

Select the message, appointment, contact, or other supported item you want to label.
Choose Categorize from the toolbar or the item’s context menu. If the command is not visible, check the More options menu.
Select one or more categories. Outlook displays the category color or name with the item where the view supports it.
To remove a label, open Categorize again and clear that category, or use the available clear-category command.

For example, you might label a supplier’s email Finance and Follow Up. It remains in its existing folder, but the two labels let you find it later by either purpose. If you categorize many items at once, check your selection before applying the label: a bulk action can affect every selected message, not just the one currently open.

How to create or rename categories

Outlook provides category-management controls, though the path depends on the version. In classic Outlook for Windows, the Categorize menu includes an All Categories option where you can create a category, rename one, choose a color, or remove a category. In newer Outlook interfaces, look for category settings or category management from the Categorize menu. If the steps in a guide do not match your screen, confirm whether you are using classic Outlook, new Outlook, or Outlook on the web.

When creating a category, choose a short name that will still make sense when you see it beside a subject line. Use a color that is easy to distinguish from your other labels. A useful setup might include:

Client: messages and events related to a particular customer or account.
Waiting: items where you are expecting a response or action from someone else.
Finance: invoices, reimbursement records, or budget-related correspondence.
Personal: non-work items in an account where you manage both kinds of mail.

These are examples, not built-in Outlook category names. Renaming a category changes the label for items carrying that category; it does not create a new folder or move those items. Removing a category can remove that label from the items that used it, so review the prompt and consequences before deleting one you rely on.

Choosing a useful category system

A category system works best when each label answers a practical question: What project is this about? What kind of item is it? What action is still needed? Avoid making a separate category for every message or creating labels that overlap so much that you cannot remember which one to use. A small, consistent set is usually easier to maintain than a long list of near-duplicates.

Decide whether your categories will describe topics, workflows, or both. Topic labels such as Hiring or Product Launch help group related work. Workflow labels such as To Review or Waiting describe what needs to happen next. If you combine the two, use clear names and apply multiple labels only when that extra detail helps. For instance, a contract email might be both Legal and Waiting.

Color is a visual aid, not a substitute for a meaningful name. Do not rely on color alone if you use Outlook on different screens, print a view, or have difficulty distinguishing particular colors. Also remember that categories can be displayed differently across layouts. The text label and a consistent naming habit should carry the meaning.

Categories across Outlook versions and devices

Outlook is available in several forms, including classic Outlook for Windows, new Outlook for Windows, Outlook for Mac, Outlook on the web, and mobile apps. Their menus and category-management features are not identical. In many Microsoft 365 and Outlook.com mailbox experiences, categories are associated with the mailbox and can appear across supported Outlook clients, but availability and behavior depend on the account type, app, and item being categorized.

If a category appears on your computer but not on your phone, first check that both apps are signed in to the same account and that the item is in that account’s mailbox. Then check whether the mobile app supports displaying or editing categories for that particular item. A category feature that exists in one desktop interface may be located elsewhere or have limited controls in another interface.

Categories are also different from a shared team taxonomy. A label you create for your own mailbox does not automatically establish a naming standard for coworkers. In a shared mailbox or shared calendar, what another person can see or change depends on permissions and how Outlook handles that shared data. For coordinated team workflows, agree on names and test them in the actual shared account rather than assuming everyone’s personal category list is identical.

Categories versus folders, flags, and rules

These Outlook tools solve different problems. A folder determines where a message is stored in the mailbox structure. A category labels an item, allowing it to remain in place while being grouped by subject or purpose. A flag marks an item for follow-up, often with a reminder or due date. A rule can automate actions such as moving or categorizing incoming messages when they meet conditions.

For example, you could use a folder for each client, a Project Alpha category across messages and meetings, and a follow-up flag on the one email that needs a response today. The message can remain in the client folder while carrying both its project label and its follow-up status. Categories are therefore a flexible complement to folders, not a replacement for every mailbox organization method.

Common category problems and fixes

If a category is missing from the menu, verify that you are looking at the expected account and Outlook version. Some menus show only recently used or available categories until you open the full category list. If you renamed a category and cannot find its old name, search for the new name or review category management rather than assuming the associated messages were deleted.

If a color or label does not appear where expected, check whether the selected item type and current view support showing it. A category may be applied even when a compact list view does not display its full name. Reopen the item’s Categorize menu to confirm its status. If changes are not appearing on another device, allow the account to sync, then verify the account and network connection before applying the label repeatedly.

Another common misunderstanding is that a category automatically sorts mail or alerts the recipient. It does neither by itself: categorizing an item adds an organizational label. To move messages automatically, use a rule where supported; to remind yourself to act, use a flag or task feature. If a category is meant for a team, confirm the sharing arrangement because a personal label is not the same as a shared workflow rule.

Frequently Asked Questions

What are the default categories in Outlook?
Common default names in classic Outlook for Windows are Red Category, Orange Category, Yellow Category, Green Category, Blue Category, and Purple Category. They are color labels and can usually be renamed; the set shown can vary by Outlook version.

Can I create my own Outlook categories?
Yes. Outlook category controls let you create and name categories and, in supported versions, choose their colors. The available steps and options depend on the app and account you use.

Can one email have more than one category?
Yes, Outlook generally allows multiple categories on an item. This is useful when a message fits more than one grouping, such as a project label and a Waiting label.

Do Outlook categories move emails into folders?
No. A category labels an item without moving it. Use a folder to change where a message is stored, or a rule to automate moving messages when its conditions are met.

Can other people see the categories I assign?
Categories are not normally sent as visible tags with an email. Access to category information in a shared mailbox or shared Outlook item depends on the sharing setup, so categories should not be used to protect confidential information.

Sources: general know-how. Menus and buttons can differ slightly by version. Spotted something out of date? Tell us.