Outlook users can define default reminder time for new calendar event. However this applies to normal events with a start hour, not to all-day events. For those events, there is a default value of 18 hours, which sets the reminder at 6am the previous morning. Most people don’t want to be reminded so early.
So I built a solution with a few lines of code to add to Outlook.
This code verifies the reminder hour when a calendar item is saved. If it is set before a minimum hour (default 9am) or after a maximum hour (default 8pm), an alert proposes a new reminder time. The user can accept or deny the proposed value or cancel the closing in case he wants to set another value manually.