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Use Outlook’s Conditional Formatting feature to make messages that match criteria stand out in the message list. You can create a rule for a sender, subject word, Cc status, recipient, or another condition available in your Outlook version, then apply a font color and other text formatting. The steps depend on whether you use new Outlook for Windows, Outlook on the web, or classic Outlook for Windows.
What Outlook highlighting actually does
Conditional formatting changes the way matching messages are displayed in the message list. It does not edit the email, move it to another folder, or change the message’s content. A message can remain in its existing folder while its text appears in the style you assign.
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Microsoft describes conditional formatting as a way to make messages stand out when they meet conditions you define. In new Outlook for Windows and Outlook on the web, Microsoft says the rules apply to both read and unread messages and to every folder except Drafts. When two rules match the same message, the rule higher in the list takes precedence.
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The navigation is different between the current Outlook interfaces and classic Outlook for Windows. Use the row that matches the menus you see.
| Outlook interface | Where conditional formatting starts | How rules are configured | Important scope or availability note |
|---|---|---|---|
| New Outlook for Windows | Settings > Mail > Conditional Formatting | An Add rule form combines the rule name, conditions, and font color | Available for qualifying work or school accounts with an eligible Microsoft 365 subscription; rules cover read and unread messages and all folders except Drafts |
| Outlook on the web | Settings > Mail > Conditional Formatting | An Add rule form exposes the conditions and formatting options supported by your account | The exact condition list can vary by account and service version |
| Classic Outlook for Windows | View > View Settings > Conditional Formatting | Separate Font and Condition dialogs are used | Some formatting choices available in classic Outlook are not available in new Outlook |
If you cannot find Conditional Formatting, first identify the Outlook application and account you are using. Microsoft states that this feature is limited to work or school accounts with a qualifying Microsoft 365 subscription. A personal account, an unsupported subscription, or a different Outlook build can therefore produce a different Settings or View menu.
Highlight emails in new Outlook for Windows or Outlook on the web
- Open Outlook and select Settings.
- Open Mail, then choose Conditional Formatting.
- Select + Add rule.
- Enter a descriptive name, such as Manager messages or Meeting subjects.
- Choose one or more conditions. Depending on your version, available choices can include the sender, words in the subject, your Cc status, the recipient, and other message criteria.
- Choose the font color that should appear in the message list. Review the preview so you can see how the text will look.
- Select OK, then select Save.
Open a message list that should contain a match and verify the result. Check both a message that should match and one that should not; this catches an overly broad condition before it affects every conversation.
Choose conditions narrowly enough to be useful
A condition is the test Outlook performs before applying the formatting. If you select a sender condition, use the specific address or person offered by the rule form. For a subject-based rule, enter a distinctive word or phrase rather than a common term that appears in unrelated mail. If your version exposes a Cc condition, use it to distinguish messages where you were copied from messages addressed directly to you.
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Some versions expose more than one condition in the same rule. Combining conditions can reduce false matches: for example, a sender plus a subject word is narrower than either test on its own. Only select controls that your form actually provides; the available fields depend on your Outlook version and account.
Set a readable color
The selected font color is applied to the message text in the list. Choose a color that remains legible against your Outlook theme and does not look like an unread indicator or a warning unless that is your intention. If several rules will be active, assign each a distinct role instead of using many nearly identical shades.
Understand rule order
When multiple rules match one message, the rule higher in the list wins. Put the most specific rule above a broad rule. For example, place a rule for a particular sender and subject above a rule that colors every message containing a general subject word. If a message displays an unexpected color, inspect the order before changing the condition.
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Highlight emails in classic Outlook for Windows
- In classic Outlook, select View.
- In the Current View group, select View Settings.
- In the Advanced View Settings dialog, select Conditional Formatting.
- Select Add and enter a name for the rule.
- Select Font and choose the formatting, including the font color.
- Select Condition and define the sender, subject, recipient, or word criteria.
- Confirm with OK in the Filter, Conditional Formatting, and Advanced View Settings dialogs until the view returns to the message list.
Classic Outlook keeps the visual choice and the matching criteria in separate dialogs. If you change the font but do not define a condition, the rule will not target the messages you intended. Conversely, a condition without a distinctive font can be difficult to notice.
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Use classic Outlook’s broader word matching carefully
Microsoft’s examples show that classic Outlook can match a word in the subject or in the message body. A body-word rule can affect many more messages than a subject rule, especially when the word is common. Start with a distinctive term and inspect the resulting list before relying on the color for triage.
Practical rules you can create
| Goal | Condition to select | Example color | How to keep the rule precise |
|---|---|---|---|
| Make a manager’s messages stand out | Sender | Red | Select the manager’s specific sender entry rather than a broad organization or domain condition when the form offers both |
| Spot meeting-related mail | A subject word such as meeting | Green | Use a term that is meaningful in your mailbox and check whether recurring notices or unrelated messages also contain it |
| See messages where you were copied | Cc status | Orange | Keep this separate from direct-to-you messages so the colors communicate different priorities |
| Emphasize a particular recipient | Recipient, if exposed by your version | Your chosen high-contrast color | Confirm whether the condition means the message was sent to that address or includes it among several recipients |
| Find a distinctive term in classic Outlook | Word in the subject or message body | Your chosen color | Prefer a distinctive phrase; common words can produce a long list of matches |
The red-manager, green-meeting, and orange-Cc examples are documented by Microsoft as illustrations of what conditional formatting can do. They are examples, not required colors; choose a scheme that makes sense for your own workload.
How scope and priority affect what you see
Read and unread messages
In new Outlook for Windows and Outlook on the web, conditional-formatting rules apply to both read and unread messages. Opening a message does not by itself remove the formatting, provided the message still satisfies the condition.
Folders covered by the rule
Those new Outlook and web rules apply across folders except Drafts. If you are checking a draft and do not see the expected color, that is the documented scope rather than evidence that the condition is wrong. The rule can still work in folders containing sent, received, or archived messages.
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Only the higher rule in the list takes precedence when rules conflict. A broad rule placed above a specific rule can hide the specific rule’s color. Arrange rules from most specific to most general, then test a message that matches both conditions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why a message is not highlighted
The Conditional Formatting menu is missing
- Check whether you are using new Outlook, Outlook on the web, or classic Outlook; the menu path differs.
- Verify that the mailbox is a work or school account with a qualifying Microsoft 365 subscription, because Microsoft identifies that as a requirement.
- If you are in classic Outlook, open the view settings for the current message list rather than looking under the new Outlook Settings panel.
- Remember that not every classic Outlook formatting option is available in new Outlook.
The rule exists but no messages match
- Recheck the sender, subject word, recipient, or Cc condition for spelling and scope.
- Test the rule against a message you know should satisfy the criterion.
- For a subject-word rule, verify that the word is actually in the subject, not only in the message body. In classic Outlook, body-word matching is available when you define that criterion; the new Outlook form may present different fields.
- Check the folder. New Outlook and web rules do not apply to Drafts.
The wrong color appears
- Look for another rule that also matches the message.
- Move the more specific rule higher in the rule list, because the higher rule takes precedence.
- Review the preview and font choice. A subtle color or a theme with similar background and text colors can make a correctly formatted message look unchanged.
Only some Outlook windows show the result
Conditional formatting changes the message list view in the Outlook interface where the rule is configured. Confirm that you are viewing the mailbox and list associated with that account, and that you are not checking Drafts when using new Outlook or the web. If the available controls differ, confirm the product version before trying to reproduce a classic Outlook rule in new Outlook.
Plan a color system that remains manageable
Conditional formatting is easiest to scan when each color has one consistent meaning. Decide whether colors represent people, urgency, workflow stage, or message type; do not mix those meanings in the same list. A simple system might reserve one color for a key sender, another for meeting subjects, and a third for Cc messages.
- Use specific rules first: place a sender-plus-subject rule above a subject-only rule if your version allows both conditions.
- Keep names descriptive: include the target and purpose, such as Finance — invoice subject, rather than leaving rules with generic names.
- Limit visual competition: too many colors can make the list harder to scan than an unformatted list.
- Review after changing a condition: inspect a matching and a nonmatching message so an edit does not silently broaden the rule.
- Account for accessibility: pair color differences with clear rule names and distinctive criteria; color alone should not be the only way you identify an important message.
Conditional formatting versus other Outlook actions
Use conditional formatting when your goal is recognition in the message list. It is appropriate for visually separating a sender, subject category, Cc messages, or another supported criterion without changing mailbox organization.
If your goal is to place messages in another folder, automatically process incoming mail, or change message state, conditional formatting is not that action. It only controls the visual treatment of messages that meet its conditions. Keep the visual rule focused on identification, and use the separate Outlook feature designed for any organizational or processing task you need.
A final verification checklist
- You identified the interface: new Outlook, Outlook on the web, or classic Outlook for Windows.
- You opened the correct path: Settings > Mail > Conditional Formatting for new Outlook or the web, or View > View Settings > Conditional Formatting in classic Outlook.
- The rule has a meaningful name and at least one condition.
- The selected font color is readable in your current Outlook theme.
- A message that should match is highlighted, and a similar message that should not match remains unchanged.
- Any overlapping rule is below the more specific rule.
- You are not testing in Drafts when using new Outlook or Outlook on the web.
- Your account and Microsoft 365 subscription meet the availability requirements.
Once those checks pass, Outlook will apply the selected formatting whenever a message meets the rule’s conditions, making the intended emails easier to recognize without altering their location or content.
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