Although you are using Windows, i have added another section that will be helpful for macOS users. I am using Outlook 365 on a Windows 10 computer. I guess my question is how to disable Outlook calendar reminders so i won’t need to get rid of them manually. Once i get a reminder, i typically dismiss it one by one, or dismiss them all.
As such i keep constantly getting reminders and notifications from Outlook on overdue appointments, meetings and tasks which is kind of overwhelming. I use my Outlook calendar to manage my business meetings and appointments, tasks and contacts but also my personal appointments, as well as reminders to call friends on their birthday.