The RFC 2980 describes the XOVER command. Use the XOverFields property to get the list of XOVER fields supported. Use the Supported property to check whether the overview information of the article is available.  Use the Field property to get a specified field from the article.

The following sample displays the all overview fields available for the first article in the "vb.general" news group:

Dim n As New EXNNTPLibCtl.NNTP

Private Sub Form_Load()
    Dim g As EXNNTPLibCtl.Group, x As EXNNTPLibCtl.XOver
    n.Connect "news.devx.com"
    Set g = n.Group("vb.general")
    Dim s() As String
    s = Split(n.XOverFields, vbCrLf)
    Set x = g.Articles.Item(g.Articles.First).XOver
    For i = LBound(s) To UBound(s)
        Debug.Print "'" & s(i) & "' = " & x.Field(s(i))
    Next
    n.Disconnect
End Sub