'// Create a Skype4COM object:
Set oSkype = WScript.CreateObject("Skype4COM.Skype","Skype_")

'// Query the total number of missed messages:
WScript.Echo "Total missed message count: " & oSkype.MissedMessages.Count

'// Query the id, timestamp, and sender Skypename of the message:
For Each oMsg In oSkype.MissedMessages
  WScript.Echo "Msg id: " & oMsg.Id & " at " & oMsg.Timestamp & " from " & oMsg.FromHandle
Next  

'// Mark the missed message as "Read"
For Each oMsg In oSkype.MissedMessages
  oMsg.Seen = True
Next