'Imports Outlook = Microsoft.Office.Interop.Outlook
Dim app As New Outlook.Application
Dim mi As Outlook.MailItem = CType(app.CreateItem(Outlook.OlItemType.olMailItem), Outlook.MailItem)
mi.To = "test@some.com"
mi.Subject = "some subject"
mi.Body = "hello Outlook message"
Dim path As String = IO.Path.Combine(Application.StartupPath, "test.msg")
mi.SaveAs(path, Outlook.OlSaveAsType.olMSG)
app.Quit()