vba - Iterate all email items in a specific Outlook folder

How can I in an Outlook VBA macro iterate all email items in a specific Outlook folder (in this case the folder belongs not to my personal inbux but is a sub-folder to the inbox of a shared mailbox.

Something like this but I've never done an Outlook macro...

For each email item in mailboxX.inbox.mySubfolder.items
// do this

next item

I tried this but the inbox subfolder is not found...

Private Sub Application_Startup()

Dim objNS As Outlook.NameSpace
Dim objFolder As Outlook.MAPIFolder
Set objNS = GetNamespace("MAPI")

Set objFolder = objNS.Folders("myGroupMailbox")
Set objFolder = objFolder.Folders("Inbox\mySubFolder1\mySubFolder2")

  On Error GoTo ErrorHandler
  Dim Msg As Outlook.MailItem

For Each Item In objFolder.Items

  If TypeName(Item) = "MailItem" Then


    Set Msg = Item
    If new_msg.Subject Like "*myString*" Then
        strBody = myItem.Body
        Dim filePath As String
        filePath = "C:\myFolder\test.txt"
        Open filePath For Output As #2
        Write #2, strBody
        Close #2

    End If


  End If

ProgramExit:
  Exit Sub
ErrorHandler:
  MsgBox Err.Number & " - " & Err.Description
  Resume ProgramExit

Next Item


End Sub