PropertyChange Event
Occurs when a standard property (for example, Subject or To) of a Microsoft Outlook item is changed. The property name is passed to the event so that you can determine which property was changed.
Sub object_PropertyChange(ByVal Name As String)
object One of the objects in the Applies To list. In VBScript, use the word Item.
Name Required. The name of the property that was changed.
Example
This example uses the PropertyChange event to disable the setting of a reminder on an item.
Sub Item_PropertyChange(ByVal myPropertyName)
Select Case myPropertyName
Case "ReminderSet"
MsgBox "You may not set a reminder on this item!"
Item.ReminderSet = False
Case Else
End Select
End Sub