title: Send Skype for business using VBA
body: <p>I am trying to send a Skype message to a group of people using VBA. 
  the below code should in theory work but I have the below error message : 
  User-Defined type not defined  for 
  aSkype As SKYPE4COMLib.Skype</p>
  
  <p>any idea ? 
  I was wondering if this was a permission issue ? </p>
  
  <p>Many thanks all </p>
  
  <pre><code>Sub Test()
    Dim aSkype As SKYPE4COMLib.Skype
    Set aSkype = New SKYPE4COMLib.Skype
    Dim oChat As Chat
    Dim skUser As SKYPE4COMLib.User
  
    Set oMembers = CreateObject("Skype4COM.UserCollection")
    oMembers.Add (oSkype.User("user_name1"))
    oMembers.Add (oSkype.User("user_name2"))
  
    Set oChat = oSkype.CreateChatMultiple(oMembers)
    oChat.OpenWindow
    oChat.Topic = "Group Chat Topic"
    oChat.SendMessage "automated message"
  End Sub
  </code></pre>