Excel mit VBA verschiedene Serienbriefe erstellen

Sub aaaaSerienbrief()
' set variables
Dim iBrief As Integer, sBrief As String
Dim AppShell As Object
Dim BrowseDir As Variant
Dim Path As String
' catch any errors
On Error GoTo ErrorHandling
' determine path
Set AppShell = CreateObject("Shell.Application")
Set BrowseDir = AppShell.BrowseForFolder(0, "Speicherort für Serienbriefe auswählen", 0, 16) _
_
_
_
If BrowseDir = "Desktop" Then
Path = CreateObject("WScript.Shell").SpecialFolders("Desktop")
Else
Path = BrowseDir.items().Item().Path
End If
If Path = "" Then GoTo ErrorHandling
Path = Path & "\Serienbrief-" & Format(Now, "dd.mm.yyyy-hh.mm.ss") & "\"
MkDir Path
On Error GoTo ErrorHandling
' hide application for better performance
MsgBox "Serienbriefe werden exportiert. Dieser Vorganag kann einige Minuten dauern -  _
Microsoft Word wird während dieser Zeit ausgeblendet", vbOKOnly + vbInformation
Application.Visible = False
' create bulkletter and export as docx
With ActiveDocument.MailMerge
.DataSource.ActiveRecord = 1
Do
.Destination = wdSendToNewDocument
.SuppressBlankLines = True
With .DataSource
.FirstRecord = .ActiveRecord
.LastRecord = .ActiveRecord
sBrief = Path & .DataFields("ID").Value & ".docx"
End With
.Execute Pause:=False
If .DataSource.DataFields("ID").Value > "" Then
ActiveDocument.SaveAs FileName:=sBrief, FileFormat:=wdFormatdocx
End If
ActiveDocument.Close False
If .DataSource.ActiveRecord  0 Then
MsgBox "Unbekannter Fehler: " & Err.Number & " - Bitte Makro erneut ausführen.",  _
vbOKOnly + vbCritical
Else
MsgBox "Serienbriefe erfolgreich exportiert", vbOKOnly + vbInformation
End If
End Sub