Outlook has an option to automatically dismiss reminders for past events.
It’s not enabled by default. Here’s how to enable it:
Automatically dismiss reminders for past events
If you don’t want to see reminders for events in the past, you can tell Outlook to automatically dismiss reminders for past events. For example, if you’re out of the office for three days, you might not want to come back and see reminders for the meetings that took place while you were gone.
Select File > Options > Advanced.
In the Reminders section, select Automatically dismiss reminders for past events.
[stolen from Jen Gentleman]
The support page documentation is here:
- Automatically dismiss reminders for past events
https://support.office.com/en-us/article/set-or-remove-reminders-7a992377-ca93-4ddd-a711-851ef3597925
kurtsh
Kurt Shintaku's Blog 