How do I add custom scripts to Outlook?
In Outlook go to Tools > Macro > visual Basic Editor
R-click on Project 1 and select Insert > Module
In Module1 add the following code:
Sub CustomMeetingRequestRule(Item As Outlook.MeetingItem)
If Item.ReminderSet = False Then
Item.GetAssociatedAppointment(False).ReminderMinutesBeforeStart = 15
End If
End Sub
Click on Save
Make your rule and the script should appear as a selection when you click on the 'a script' link.
The code should perform what you were after in your other question but haven't tested it.
Reference link: http://support.microsoft.com/kb/306108
Scripts in Outlook are also known as macros. I believe Alt+F11 will bring up the VBA script editor for Outlook macros.