To change the default alert settings for all events in a specific category in your Microsoft calendar.

1. Open ‘Calendar’ in Microsoft Office.
2. Select the ‘View’ tab at the top of the screen.
3. Open ‘Change View’ and select ‘Manage All Categories’ from the dropdown.
4. Select the specific category for which you want to change the default settings.
5. You can change the default alert settings from the ‘Alert Settings’ window.
6. Click ‘OK’ to save the settings.