Calendar Problems

Fix Outlook Reminder Will Not Appear in an Unsupported Folder

Maira MehtabMaira Mehtab Oct 28, 2026 868 views

Question details

The user receives a warning message in Outlook stating that calendar event reminders will not trigger because the designated folder does not support them.

How to Fix Outlook Reminders Not Appearing in an Unsupported Folder
Product
Outlook for Microsoft 365
Device & OS
not provided
Scenario
Creating or editing an appointment in Outlook while utilizing an iCloud calendar synchronization.
Observed behavior
Outlook displays a warning that the appointment reminder will not appear because the item is stored in a folder that does not support reminders.
Before you start

Ensure that your Outlook desktop client is updated to the latest version and that the iCloud for Windows app is installed and actively signed in on your computer.

Solution 1Recommended

Enable the iCloud Outlook Add-in

Re-enabling the iCloud Outlook add-in restores proper synchronization between Outlook and your Apple ecosystem, often resolving the reminder limitation warning.

Outlook sometimes disables third-party add-ins automatically if it detects that they are slowing down the application's startup time. When the iCloud add-in is disabled, calendar events may fail to sync properly, leading to unsupported folder errors.

1
Open Outlook Options

Launch Outlook, click on the 'File' tab in the top-left corner of the ribbon, and select 'Options' from the bottom of the left-hand menu.

2
Access COM Add-ins

In the Outlook Options window, click on 'Add-ins' in the left pane. At the bottom of the screen, ensure the 'Manage' dropdown is set to 'COM Add-ins' and click the 'Go...' button.

3
Enable iCloud Add-in

Locate the 'iCloud Outlook Add-in' in the list of available add-ins. Check the box next to it to enable it, then click 'OK'. Restart Outlook for the changes to take effect.

Enable the iCloud Outlook Add-in
Prevent Future Disabling: To prevent Outlook from disabling the add-in again, go to File > Info > Slow and Disabled COM Add-ins, and select 'Always enable this add-in' for the iCloud integration.
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Frequently Asked Questions

Why does Outlook say my folder does not support reminders?

This message typically appears when you save an event in a calendar folder synchronized via a third-party service (like iCloud or an IMAP connection) that does not natively integrate with Outlook's local reminder system.

Will my calendar event still sync to iCloud if I ignore the warning?

Yes, as long as the iCloud add-in is active, the event itself will successfully synchronize to your iCloud account and appear on your other devices. The warning only means that the Outlook desktop application won't generate a pop-up reminder on your PC.

Does this reminder issue affect native Microsoft Exchange accounts?

No. Exchange and Outlook.com calendars natively support Outlook's reminder features. This limitation is specific to internet calendars and third-party syncing tools like iCloud for Windows.