Я использую следующую подпрограмму VBA для удаления встреч из моего календаря.
Public Sub deleteSelectedAppointment()
    Dim obj As Object
    Dim cl As Integer
    Dim apt As AppointmentItem
    Dim aptDel As AppointmentItem
    Dim pattern As RecurrencePattern
    Dim cnt As Integer
    On Error GoTo ErrHandler
    cnt = 0
    For Each obj In ActiveExplorer.Selection
        cl = obj.Class
        Select Case cl
        Case olMail
        Case olTask
        Case olAppointment
            Set apt = obj
            Debug.Print "Appointment " & apt.subject
            If apt.IsRecurring Then
                '  find and delete the selected item in a series
                Set pattern = apt.GetRecurrencePattern()
                Set aptDel = pattern.GetOccurrence(apt.Start)
            Else
                '  non-recurring appointment
                Set aptDel = apt
            End If
            If aptDel Is Nothing Then
                Debug.Print "Nothing to delete!"
            Else
                aptDel.Delete
                cnt = cnt + 1
            End If
        Case Else
            Debug.Print "unexpected class " & cl
        End Select
    Next obj
    Debug.Print "Deleted appointments: " & cnt
    Exit Sub
ErrHandler:
    MsgBox "Cannot delete appointment" & vbCrLf & Err.Description, vbInformation
    Err.Clear
    On Error GoTo 0
End Sub
Это также работает для задач и почты. Очевидно, что такая процедура может удалить много, если не использовать с осторожностью ...