Event

Is there an event in Outlook 2000 and 2003 VBA that occurs when a Calendar Item is added, modified or deleted ?

Yes there are events for all three of your requested events. :D

VB Code:

Option Explicit
 
Public WithEvents oCalFolder As Outlook.items
 
Private Sub Application_MAPILogonComplete()
    Set oCalFolder = Application.GetNamespace("MAPI").GetDefaultFolder(olFolderCalendar).items
End Sub
 
Private Sub oCalFolder_ItemAdd(ByVal Item As Object)
    MsgBox "Item: " & Item.Subject & " Added"
End Sub
 
Private Sub oCalFolder_ItemChange(ByVal Item As Object)
    MsgBox "Item: " & Item.subjet & " Modified!"
End Sub
 
Private Sub oCalFolder_ItemRemove()
    MsgBox "Item Deleted"
End Sub

It's not firing the event in Outlook 2003. Do I have to do something to activate the macro?

Make sure you have macros enabled and log off and restart Outlook.

What I want to do is when something is add to the personal calendar, it's copied to a public folder. But with these event, I can't do it perfectly. I don't know which one has been deleted and which one has been modified

What do you mean? Item is passed in the Added and Changed events

VB Code:

Private Sub oCalFolder_ItemChange(ByVal [b]Item[/b] As Object)

In the change event, how can I find the original one in the public folder if it changed ?