In a Microsoft Exchange Server 2016 or 2019 environment, a user creates a meeting request in Outlook or Outlook on the web client and sets the Reminder to "None". When the attendee receives the meeting request, the reminder is changed to "15 minutes". It's expected that the reminder is set to "None".
In addition, you try the following steps to fix this issue, but the meeting reminder is still set to "15 minutes" when the attendee receives the meeting request:
- Put a file that's named StoreDriver.config into Exchange installation Bin folder, such as C:\Program Files\Microsoft\Exchange Server\V15\Bin with the following contents:
<add key="AlwaysSetReminderOnAppointment" value="false" />
- Restart the MSExchangeDelivery service.
- Create a meeting request and test again.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.