I have used this in the past by adding this sub to the VBA page and plugging your rule so that it works when you receive it from senders certian and invite it to invite or update.
Sub AutoAccept(ByRef Item As Outlook.MeetingItem)
Dim strID As String
Dim olNS As Outlook.NameSpace
Dim oMeetingItem As Outlook.MeetingItem
Dim oResponse As Outlook.MeetingItem
Dim oAppointment As Outlook.AppointmentItem
strID = Item.EntryID
Set olNS = Application.GetNamespace("MAPI")
Set oMeetingItem = olNS.GetItemFromID(strID)
Set oAppointment = oMeetingItem.GetAssociatedAppointment(True)
Set oResponse = oAppointment.Respond(olMeetingAccepted)
oResponse.Send
oAppointment.Save
oMeetingItem.Save
Set oAppointment = Nothing
Set oMeetingItem = Nothing
Set olNS = Nothing
End Sub
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