How To Flag An Email In Outlook

Flagging an email in Outlook adds a visual reminder that helps you track important messages in your inbox. Learning how to flag an email in outlook is a simple but powerful way to stay organized and never miss a follow-up. This guide walks you through every method, from basic flags to advanced color coding and reminders.

Outlook flags are like digital sticky notes. They sit next to your messages, ready to grab your attention. You can use them for tasks, deadlines, or just to mark something you want to read later. Let’s get started.

Flagging an email in Outlook is straightforward, but the exact steps depend on which version you use. Below, we cover the desktop app, web version, and mobile app. Each method takes just a few seconds.

Flag An Email In Outlook Desktop (Windows And Mac)

The desktop version of Outlook offers the most flagging options. Here’s how to do it step by step.

Open Outlook on your computer.
Go to your inbox and find the email you want to flag.
Hover your mouse over the email. You will see a small flag icon appear on the right side of the message line.
Click the flag icon once. It turns red, meaning the email is now flagged.
To set a reminder, right-click the flag icon. A menu pops up with options like “Today,” “Tomorrow,” “This Week,” “Next Week,” or “Custom.”
Choose a time frame. Outlook will add a reminder to your calendar or task list.

You can also flag an email while it is open. Just click the “Follow Up” button in the toolbar at the top of the message window. Select a flag option from the dropdown menu.

On a Mac, the process is similar. Look for the flag icon in the message list or use the “Message” menu at the top of the screen. Click “Follow Up” and pick your flag type.

Flag An Email In Outlook On The Web

Outlook on the web (outlook.com) works a bit differently. The flag icon is still there, but it behaves slightly different.

Log in to your Outlook account in a browser.
Navigate to your inbox.
Hover over any email. You will see a flag icon on the left side of the message line.
Click the flag icon. It turns red, flagging the email.
To add a reminder, right-click the flag (or click the three dots next to it). Select “Add Reminder.”
Set a date and time for the reminder. Outlook will notify you when it is due.

You can also flag from the reading pane. When you open an email, look for the flag icon near the top of the message. Click it to toggle the flag on or off.

Flag An Email In Outlook Mobile App

The Outlook mobile app for iOS and Android makes flagging easy on the go. Here is how.

Open the Outlook app on your phone.
Tap the inbox icon to see your messages.
Swipe left on the email you want to flag. A menu appears with options like “Flag,” “Archive,” and “Delete.”
Tap “Flag.” The email gets a red flag icon next to it.
To set a reminder, tap the email to open it. Then tap the flag icon at the top of the screen. Choose a reminder time from the list.

You can also long-press an email in the inbox view. This selects it and shows a toolbar at the bottom. Tap the flag icon there.

Customizing Flags With Colors And Categories

Basic red flags are useful, but Outlook lets you take it further. You can assign colors or categories to flags for better organization. This helps you see at a glance what needs urgent attention.

Change Flag Color In Outlook Desktop

Outlook desktop allows you to change the flag color. This is handy for color-coding tasks.

Right-click the flag icon next to an email.
Select “Set Quick Flag.” A small color palette appears.
Pick a color like blue, green, yellow, or purple. The flag changes to that color.
You can also choose “No Date” to keep the flag without a reminder.

Note that flag colors only work in the desktop version. On the web and mobile, flags remain red by default.

Use Categories With Flags

Categories are another layer of organization. You can combine them with flags to mark emails by project, priority, or client.

Right-click a flagged email in your inbox.
Select “Categorize” from the menu.
Choose a category like “Red Category,” “Blue Category,” or create your own.
The email now shows both a flag and a colored category bar.

To create custom categories, go to the “Home” tab, click “Categorize,” and select “All Categories.” Add new names and colors there.

Managing And Clearing Flags

Once you finish a task or respond to an email, you should clear the flag. This keeps your inbox clean and accurate. Here is how to manage flags.

Mark A Flag As Complete

When you finish with a flagged email, you can mark it as complete instead of deleting the flag. This adds a checkmark icon.

Right-click the flag icon next to the email.
Select “Mark Complete.” The red flag changes to a checkmark.
The email moves to the “Completed” view in your flagged items folder.

This is great for tracking what you have done. You can still see the email later if needed.

Clear A Flag Completely

To remove a flag entirely, follow these steps.

Right-click the flag icon.
Select “Clear Flag.” The flag disappears, and the email returns to normal.
You can also click the flag icon directly to toggle it off.

On the web version, click the flag again to remove it. On mobile, swipe left and tap “Unflag.”

View All Flagged Emails

Outlook has a dedicated view for flagged items. This helps you see everything at once.

In the desktop app, click the “Flagged” folder in the navigation pane. It is usually under “Search Folders.”
On the web, click the filter icon above your inbox. Select “Flagged” from the dropdown.
On mobile, tap the search bar at the top of the inbox. Then tap “Flagged” in the suggestions.

You can also create a custom search folder for flagged emails. Right-click “Search Folders” in the desktop app and choose “New Search Folder.” Select “Flagged mail” from the list.

Using Flags For Task Management

Flags are not just for emails. Outlook integrates them with your task list. This turns a simple flag into a to-do item.

Turn A Flagged Email Into A Task

When you flag an email with a reminder, Outlook automatically creates a task in the Tasks module. Here is how it works.

Flag an email with a due date (e.g., “Tomorrow”).
Go to the Tasks view in Outlook (bottom-left corner in desktop).
You will see the flagged email listed as a task. The subject line becomes the task name.
Click the task to see the original email content in the preview pane.

This syncs with your calendar if you set a reminder. You get a pop-up alert at the chosen time.

Create A Task Directly From An Email

You can also create a separate task without flagging the email itself.

Drag an email from your inbox to the Tasks icon in the navigation pane.
A new task window opens with the email subject as the task title.
Add details like due date, priority, and notes.
Save the task. The original email stays in your inbox.

This method keeps your inbox clean while still tracking action items.

Flagging Emails On Shared Mailboxes

If you use a shared mailbox with a team, flagging works a bit differently. Flags are personal, meaning only you see them. Other users in the shared mailbox will not see your flags.

To flag an email in a shared mailbox, open the mailbox in your Outlook profile. Then follow the same steps as for your personal inbox. The flag only appears in your view.

For team collaboration, consider using categories instead. Categories can be shared if you set up a common category list. This way, everyone sees the same color coding.

Troubleshooting Common Flag Issues

Sometimes flags do not behave as expected. Here are common problems and fixes.

Flag Not Showing Up

If you click the flag icon but nothing happens, try these steps.

Refresh your inbox by pressing F5 (Windows) or Cmd+R (Mac).
Check if you are in a different view, like “Unread Mail.” Switch back to “All Mail.”
On the web, clear your browser cache and reload.
On mobile, close and reopen the app.

Reminder Not Working

If you set a reminder but do not get a notification, check these settings.

Make sure Outlook reminders are enabled. Go to File > Options > Advanced and scroll to “Reminders.” Ensure the box is checked.
On the web, check your browser notification settings. Allow outlook.com to send notifications.
On mobile, go to Settings > Notifications and ensure Outlook alerts are on.

Flag Disappears After Moving Email

When you move a flagged email to another folder, the flag should stay. If it disappears, it might be a sync issue. Try these fixes.

In desktop, go to Send/Receive tab and click “Update Folder.”
On the web, refresh the page.
On mobile, pull down to refresh the inbox.

If the problem persists, repair your Outlook data file. Go to File > Account Settings > Data Files. Select your file and click “Repair.”

Keyboard Shortcuts For Flagging

Speed up your workflow with keyboard shortcuts. These work in the desktop version.

Windows: Select an email and press Insert. This toggles the flag on or off.
Mac: Select an email and press Cmd+Shift+G. This opens the flag menu.
To set a quick flag with default date: Press Ctrl+Shift+G (Windows) or Cmd+Shift+G (Mac) and then press Enter.

On the web, shortcuts are different. Press ? to see a list of available shortcuts. For flagging, you may need to use the mouse.

Best Practices For Using Flags

Flags are most effective when used consistently. Here are some tips to get the most out of them.

Use flags only for emails that require action. Do not flag every message.
Set a due date for each flag. This turns it into a real task.
Review your flagged items daily. Clear or complete flags as you go.
Combine flags with categories for better organization. For example, use red flags for urgent, blue for follow-up.
Avoid flagging emails you have already read and archived. Keep flags active only for pending items.

By following these practices, your inbox stays manageable and your tasks stay visible.

Frequently Asked Questions

What is the difference between flagging and starring an email in Outlook?

Flagging adds a task reminder and can sync with your calendar. Starring (or “pinning”) just keeps the email at the top of your inbox. Flags are for action items; stars are for quick reference.

Can I flag an email in Outlook without a reminder?

Yes. When you click the flag icon without right-clicking, it sets a default “No Date” flag. This adds the red flag without any reminder. You can change it later if needed.

How do I flag multiple emails at once in Outlook?

In the desktop version, hold Ctrl (Windows) or Cmd (Mac) and click each email you want to flag. Then right-click one of the selected emails and choose “Follow Up” > “Flag.” All selected emails get flagged at once.

Do flags sync across all my devices?

Yes, if you use the same Outlook account on desktop, web, and mobile. Flags sync via Exchange or Microsoft 365. Changes made on one device appear on others within a few seconds.

Can I print a list of my flagged emails?

Yes. Go to the “Flagged” folder in the desktop app. Then go to File > Print. Choose “Table Style” to print a list of flagged emails with their subjects and due dates.

Flagging emails in Outlook is a small habit that saves you time and stress. Whether you use the desktop app, web version, or mobile app, the process is quick and intuitive. Start flagging today and watch your inbox become a well-organized command center.