New Outlook Category Colors in Mail Settings: Location and Practical Limits

You want to find and manage category colors in the new Outlook for Windows but cannot locate the familiar settings from classic Outlook. The new Outlook replaces the old color categories system with a simpler color picker that has fewer options and no custom color support. This article explains where to find category color settings in new Outlook, what practical limits exist, and how to work around them.

Category colors in new Outlook are set per category and stored in your Microsoft 365 mailbox. Unlike classic Outlook, new Outlook does not allow you to assign custom RGB colors or rename categories from the same dialog. The color picker offers 25 predefined colors only.

This article covers the exact location of category color settings in new Outlook, the 25-color limit, the inability to create custom colors, and how category colors sync across devices.

The New Outlook Category Color System: How It Works

New Outlook for Windows uses a cloud-based category system that syncs categories and their colors across all your devices signed into the same Microsoft 365 account. Each category stores a color index value, not an RGB code. When you assign a color, new Outlook saves that color index to your mailbox in Exchange Online.

The color picker in new Outlook contains 25 swatches arranged in a grid. These swatches include the same base colors available in classic Outlook but omit the custom color option. You cannot type a hex value or adjust a color slider. The 25 colors cover the visible spectrum plus gray and black tones.

Categories created in classic Outlook with custom RGB colors will appear in new Outlook with the closest matching predefined color. New Outlook does not display the original custom color. If you change the color in new Outlook, it overwrites the custom color value in the mailbox. This change is permanent unless you revert it from classic Outlook.

Where Categories Are Stored

Categories in new Outlook are stored as part of your mailbox in Exchange Online. They are not stored locally in a PST file or on your computer. This means category colors are available on any device where you sign into new Outlook with the same Microsoft 365 account. The category list and colors sync automatically within a few minutes.

How Category Colors Affect Email Display

When you assign a category to an email message in new Outlook, the category name and its color appear as a colored tag in the message list. The color appears as a small rectangle next to the category name. The background of the message row does not change color. Only the category tag shows the color.

Steps to Locate and Change Category Colors in New Outlook

Follow these steps to find the category color settings in new Outlook and change the color of any existing category.

1. Open Outlook Settings
   Click the Settings gear icon in the upper-right corner of the Outlook window. Alternatively, press Ctrl + Comma on your keyboard.
2. Go to Mail > Categories
   In the Settings panel, click Mail on the left sidebar. Then click Categories in the list of mail settings. This opens the category management page.
3. Select a Category to Change
   You will see a list of all your existing categories. Each row shows the category name and a colored circle next to it. Click the category name or the colored circle to open the edit panel for that category.
4. Choose a New Color
   In the edit panel, click the Color dropdown. A grid of 25 color swatches appears. Click any swatch to select it. The preview circle next to the category name updates immediately.
5. Save the Change
   Click Save at the bottom of the edit panel. The new color is applied to all items that use this category. The change syncs to your other devices within a few minutes.

Practical Limits of Category Colors in New Outlook

New Outlook imposes several limits on category colors that affect how you organize your mailbox. Understanding these limits helps you avoid frustration and plan your category system.

25-Color Limit: No Custom RGB or Hex Colors

The most significant limit is the fixed set of 25 colors. You cannot create a custom color by entering an RGB value, hex code, or HSL value. If you need a specific brand color or a color that is not in the 25-swatch grid, you cannot use it. The 25 colors are the same across all new Outlook installations and cannot be extended.

No Color Categories in Classic Outlook Style

Classic Outlook allowed you to assign categories with custom colors and rename them from the same dialog. New Outlook separates category naming and color selection. You rename a category by editing its name in the text field. You change its color from the Color dropdown. There is no single dialog that shows both fields together.

Category Colors Do Not Affect Message List Row Background

In classic Outlook, you could configure categories to change the background color of the entire message row in the inbox. New Outlook does not support this feature. The category color only appears as a small tag next to the category name in the message list. The message row background remains white or the default theme color.

No Quick Click Category with Color

Classic Outlook had a Quick Click feature that let you assign a default category with one click. New Outlook does not have a Quick Click feature. You must right-click a message, select Categorize, and then choose the category from the list. You cannot assign a category with a single keyboard shortcut.

Category Colors Sync but Not Immediately

When you change a category color in new Outlook, the change syncs to your other devices through Exchange Online. The sync can take up to 15 minutes in some cases. If you do not see the color change on another device immediately, wait and refresh the mailbox by pressing F5.

If You Need More Color Options: Workarounds and Alternatives

If the 25-color limit does not meet your needs, consider these workarounds and alternatives.

Use Classic Outlook for Custom Colors

If you have access to classic Outlook on your computer, you can create categories with custom RGB colors there. Open classic Outlook, go to the Categorize button, click All Categories, and create a new category with a custom color. The custom color will sync to new Outlook, but new Outlook will display the closest matching predefined color instead of the custom color. The original custom color value remains in the mailbox. If you change the color in new Outlook, the custom color is lost.

Use Categories with Descriptive Names

Because color options are limited, use descriptive category names to convey meaning. For example, instead of relying on a specific shade of blue, name the category “Client Project – Urgent” and assign it the blue color swatch. The name provides clarity that the color alone cannot.

Use Folders Instead of Categories for Visual Organization

If you need visual separation in the message list, create folders in your mailbox and move messages into them. Folders do not rely on color. You can create a folder hierarchy that matches your project or client structure. This approach gives you unlimited organizational options without color limits.

Item	Classic Outlook	New Outlook
Number of available colors	25 predefined plus custom RGB	25 predefined only
Custom color support	Yes, RGB and hex values	No
Color affects message row background	Optional (conditional formatting)	No
Quick Click category assignment	Yes	No
Sync across devices	Yes, via Exchange Online	Yes, via Exchange Online
Settings location	Categorize > All Categories	Settings > Mail > Categories

You now know the exact location of category color settings in new Outlook and the practical limits of the 25-color system. Use descriptive category names to compensate for the lack of custom colors. If you need more visual organization, create folders instead of relying on category colors. Consider keeping classic Outlook available if your workflow depends on custom RGB category colors.