New Outlook Reminders Not Popping Up on Windows 11: How to Fix It

Why Are My New Outlook Reminders Not Popping Up?

Three settings gate reminder popups in new Outlook on Windows 11: Outlook's own notification toggle, Windows' app-level notification permission, and Focus Assist. If any one of them is off, the reminder fires internally but never shows on screen.

I ran into this after Microsoft pushed my mailbox from classic Outlook to new Outlook. Meetings I'd set 15-minute reminders on came and went with no popup, no sound, nothing in the notification center either. Here's the order I checked things in, fastest fix first.

How Do I Turn Reminders Back On Inside New Outlook?

Open the Settings gear icon in the top right corner of new Outlook, select General, then Notifications. Find the Calendar tile and switch it on.

That single tile controls whether calendar and meeting reminders generate a popup at all. On my machine it had reset to off during the classic-to-new migration, with no prompt or warning. Once you're on that Notifications screen:

• Confirm the Calendar tile shows "On," not just visible
• Check the popup style dropdown next to it and set it to your preference (banner or toast)
• Turn on the notification sound toggle if you want audio along with the visual popup
• Repeat this check for the Mail tile too, since a muted Mail tile sometimes gets toggled off in the same migration pass

If you manage more than one mailbox in new Outlook, click each account in the left sidebar and confirm its notification settings separately. New Outlook applies notification preferences per account, not globally, so fixing your primary inbox doesn't fix a secondary one.

Is Windows 11 Blocking Outlook Notifications at the System Level?

Outlook's internal toggle only works if Windows itself allows Outlook to show notifications. Go to Settings, System, Notifications, scroll to the app list, find Outlook, and confirm the switch next to it is on.

This is separate from anything inside Outlook, and it's easy to miss because Outlook's own settings will look correct while Windows silently drops every popup. To check it:

1. Press Windows key + I to open Settings
2. Select System, then Notifications
3. Scroll down to "Notifications from apps and other senders"
4. Locate Outlook in the list
5. Toggle it on if it's off

Click the Outlook entry itself (not just the toggle) to expand additional options. Windows lets you set notifications to show on the lock screen, play a sound, and show in the notification center as separate switches. If reminders show in the notification center but never pop up as a banner, the "Show notification banners" option under that expanded view is usually the one that's off.

Is Focus Assist or Do Not Disturb Silencing Your Reminders?

Focus Assist, now labeled Do Not Disturb in current Windows 11 builds, suppresses banner notifications even when Outlook and Windows notification settings are both correct. Check the Notification Center by clicking the date and time in the taskbar, then confirm Do Not Disturb is off.

I lost twenty minutes chasing this one because Do Not Disturb had turned itself on automatically during a screen-sharing session and stayed on afterward. Windows 11 can auto-enable it when you duplicate your display, play a game in full screen, or mirror to a second monitor, and it doesn't always revert on its own.

To check and fix it:

• Click the clock and date in the bottom right of the taskbar
• Look for the Do Not Disturb toggle at the top of the panel
• Turn it off if it's active
• Open Settings, System, Notifications, and check the "Turn on Do Not Disturb automatically" rules further down the page
• Uncheck any automatic rule you don't want (Duplicating display and Playing a game are the two that catch most people)

Reminders that fired during a Do Not Disturb window don't queue up and appear later. They're gone. That's part of why this issue feels intermittent instead of constant.

Does Outlook Need to Stay Open for Reminders to Work?

Yes. New Outlook has to be running, even in the background, for a reminder to trigger at its scheduled time. Closing the app fully, rather than minimizing it to the taskbar or system tray, stops every pending reminder until you reopen Outlook.

Check whether Outlook is set to launch automatically and stay running:

1. Open Settings inside Outlook (the gear icon), then General
2. Look for "Start Outlook automatically when I sign in to Windows"
3. Turn it on if your workflow depends on reminders firing without you manually opening the app each morning

If you close Outlook with the X button, Windows 11 fully quits the app by default rather than sending it to the tray, unlike some older Outlook builds. Minimizing instead of closing keeps it running and keeps reminders active.

What If Reminders Show But Get Stuck Behind Other Windows?

Some users migrating from classic Outlook report the reminder window appearing minimized in the taskbar instead of popping to the front. If notifications work everywhere else but you only notice reminders after the fact, check your taskbar for a flashing Outlook icon during meeting times.

This happens most often on multi-monitor setups where the reminder window opens on a display that isn't your active one. Moving Outlook's main window to your primary monitor before your next scheduled reminder usually resolves it, since the reminder popup tends to inherit the window position of the main app.

Quick Checklist Before You Give Up

Run through these in order. Each one has caught the issue for someone:

• Settings, General, Notifications inside Outlook: Calendar tile is on
• Windows Settings, System, Notifications: Outlook is allowed to notify
• Notification Center: Do Not Disturb is off, and no automatic rule is quietly turning it on
• Outlook is running in the background, not fully closed
• Each mailbox you manage has its own notification settings checked separately
• Default reminder time is actually set on the calendar event itself (right-click the event, Edit, and confirm a reminder interval is chosen rather than "None")

That last one trips people up after a migration. New Outlook sometimes imports recurring events without a reminder value if the original event predates your account's move to new Outlook. Open a recent meeting, check the reminder dropdown, and reset it if it reads "None."

If you've gone through every item above and reminders still don't appear, sign out of new Outlook completely and sign back in. A stale notification token between Outlook and Windows' notification service is rare but does happen after a Windows update, and a fresh sign-in forces Outlook to re-register with the notification system.

Related Reading

• Why Outlook Rules Stop Working in New Outlook for Windows 11
• Outlook Stuck on Working Offline? Here's How to Fix It
• Outlook Email Login Problems: How to Fix Sign-In Errors That Keep Coming Back