How to fix missing or disappeared calendar reminders in Outlook?

1. Make sure the Outlook reminder windows are open and not minimized.
2. Check if the reminder alarm for the meeting in question is set.
3. Check your Outlook Calendar settings and rules.
4. Look for hidden calendar, tasks and reminders.
5. Scroll down through all Outlook reminders.
6. Check your other data files.
7. Disable all third-party add-ins.
8. Reset calendars and tasks.
9. Check Deleted Items folder.
10. Recreate damaged personal folders (PST) files.
11. Try creating your reminder in an online version of Outlook.