Category: Tech Tip | Published: 2026-08-27
A busy inbox can make an important message look exactly like every other message. If you regularly search for emails from a key customer, a manager, or a particular project, Outlook has a useful way to make those messages easier to see.
Conditional formatting changes the way matching messages appear in your inbox. You can assign a colour, font, or style to emails that meet a condition, helping them catch your eye while you scan the list. The messages stay in their usual folder, so you do not have to maintain a complicated collection of rules that moves mail around your mailbox.
This is a small Outlook email improvement, but it can make a noticeable difference when your working day involves a constant stream of messages.
Why Use Conditional Formatting?
Outlook already offers several ways to organise email. You can flag a message, move it into a folder, mark it as important, or create a rule that handles it automatically. Those options are useful, but they can also add extra steps to your routine.
Conditional formatting takes a visual approach. For example, you could display a customer’s emails in red, show messages from your manager in blue, or highlight emails with a project name in green. The inbox remains familiar, but the messages you care about are easier to identify at a glance.
It is particularly helpful when you want to notice a message quickly without changing where it is stored. You can still use search, folders, flags, and categories alongside the formatting.
Set Up Outlook Email Formatting in New Outlook
The newer Outlook experience has a straightforward conditional-formatting menu. The exact labels can change slightly as Microsoft updates the app, but the process is generally as follows:
1. Open Outlook and select Settings.
2. Choose Mail, then open Conditional Formatting.
3. Select + Add rule.
4. Give the rule a clear name, such as “Priority customer” or “Project Phoenix”.
5. Select the condition that should trigger the formatting, such as a sender or a word in the subject.
6. Choose the colour or style you want to apply.
7. Select OK, then save the rule.
The condition you choose depends on how you work. If a person’s messages are important regardless of the subject, use their email address. If you want to follow a project, a phrase in the subject may be more useful.
Keep the first rule simple and test it with a few messages. A rule that is too broad can make half of your inbox look the same, which removes the benefit of highlighting anything.
Set Up Conditional Formatting in Classic Outlook
Classic Outlook provides more control over the appearance and conditions. To create a rule there:
1. Open the View tab.
2. Select View Settings.
3. Choose Conditional Formatting.
4. Select Add and enter a name for the new rule.
5. Select Font to choose a colour, typeface, or style.
6. Select Condition to specify which emails should match.
7. Confirm the settings and select OK to save them.
The condition window lets you target email in several ways. You can use a particular sender, words in the subject, or other available message details. This makes classic Outlook useful for more specific inbox views, such as highlighting messages that mention a client and a project reference.
If you create several rules, review their order and scope. Overlapping rules can make it difficult to predict which style will be displayed. Give each rule a descriptive name so you can find and adjust it later.
Useful Examples for a Busy Inbox
There are plenty of practical ways to use this Outlook email feature without turning the inbox into a rainbow of competing colours.
- Highlight messages from your largest customer so urgent requests are easier to find.
- Use one colour for internal management messages and another for external contacts.
- Make emails containing a live project code stand out during a delivery period.
- Give automated alerts a muted style so they remain visible without overpowering human messages.
- Highlight messages addressed directly to you when you are part of a large shared mailbox.
A restrained colour scheme is usually easier to work with than a separate colour for every category. Two or three clear visual priorities can be more useful than a dozen rules that require constant interpretation.
Conditional Formatting Compared with Outlook Rules
It is worth understanding the difference between formatting and a conventional Outlook rule. A rule can move incoming email, forward it, assign a category, delete it, or perform another action. Conditional formatting changes the appearance of a message in the list.
That means conditional formatting is a good fit when you want to keep messages in the inbox and simply make them easier to scan. A rule is usually better when the message needs to be routed or processed automatically.
The two features can work together. For example, a rule might place newsletters in a reading folder while conditional formatting highlights messages from a key customer in the main inbox. Choosing the least complicated option for each task makes the system easier to maintain.
A Few Things to Check If It Does Not Work
If a new style does not appear, start by checking the condition. A sender condition may need the full email address rather than the display name. A subject condition may also fail if the wording changes between messages.
Check whether the rule is enabled and whether the messages are being viewed in the mailbox where the formatting was created. Shared mailboxes and different Outlook accounts can have separate settings.
It is also worth checking which Outlook app you are using. New Outlook and classic Outlook do not expose exactly the same options, and some advanced settings available in the classic version may not yet be present in the newer experience. A work or school account may also need a qualifying Microsoft 365 subscription for conditional formatting.
If several rules match the same message, simplify them temporarily to identify the conflict. Removing an old rule that no longer reflects your work can be more effective than adding another rule on top of it.
Keep Your Visual System Manageable
Email organisation works best when it supports your decisions rather than creating another system to manage. Review conditional-formatting rules every few months, especially after a project finishes or a colleague changes role.
Use names that explain the purpose of each rule. “Important customer” is more useful six months later than “Rule 4”. Avoid using bright colours for routine messages, and reserve the strongest visual treatment for messages that genuinely need your attention.
You may also want to combine formatting with a sensible notification approach. Not every highlighted message needs an instant alert, and constant notifications can make it harder to concentrate. A clear inbox view lets you decide when to review priority mail.
What This Outlook Email Tip Means for Your Business
A few well-chosen formatting rules can help people work through a busy inbox with less friction. They do not replace good email habits, clear subject lines, or an agreed approach to urgent requests, but they can make useful information easier to find.
If your organisation needs help managing Microsoft 365, email accounts, shared mailboxes, or wider workplace technology, our Managed IT support page explains how we can help.