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The entire version number is available in the Application.Version property. The first two digits reveal the major version.
| Outlook Version | Version Number | 
| 2013 | 15.x | 
| 2010 | 14.x | 
| 2007 | 12.x | 
| 2003 | 11.x | 
| 2002 | 10.x | 
| 2000 | 9.x | 
Private Function GetOutlookVersion() As Long
  Dim v as String
  v = left$(Application.Version, 2)
  Select Case v
  Case "8.": GetOutlookVersion = 8
  Case "9.": GetOutlookVersion = 9
  Case Else: GetOutlookVersion = v
  End Select
End Function