vb.net and Outlook 2010

I have a simple Visual Basic application that emails a report (html format) with Outlook.  It works fine with Outlook 2007, but fails with Outlook 2010.  I've changed the references from Microsoft.Office.Interop.Outlook 12.0 to 14.0, but that didn't help.  The debug code below works with Outlook 2007, but not Outlook 2010.  Any ideas?
Imports Microsoft.Office.Interop.Outlook
Public Class Form1
    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Dim HTML As String = "<html><head><title>testtesttest</title></head><body><div><h1>1<br>2<br>3</h1></div></body></html>"
        Dim app As New Microsoft.Office.Interop.Outlook.Application
        Dim appNameSpace As Microsoft.Office.Interop.Outlook._NameSpace = app.GetNamespace("MAPI")
        appNameSpace.Logon(Nothing, Nothing, False, False)
        Dim memo As Microsoft.Office.Interop.Outlook.MailItem = app.CreateItem(Microsoft.Office.Interop.Outlook.OlItemType.olMailItem)
        memo.To = "fred.flintstone@rubble.com"
        memo.Subject = "Barney..."
        memo.HTMLBody = HTML
        memo.Display()
    End Sub
End Class

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motokentAsked:
Who is Participating?
 
Éric MoreauSenior .Net ConsultantCommented:
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CodeCruiserCommented:
Do you get an error?
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motokentAuthor Commented:
Yes.  See the code section for the error.  I might have stumbled across the solution... just comment out the two lines:
Dim appNameSpace As Microsoft.Office.Interop.Outlook._NameSpace = app.GetNamespace("MAPI")
appNameSpace.Logon(Nothing, Nothing, False, False)

I don't remember why those lines were there to begin with, but they must not be necessary.  Can you comment about them?
System.Runtime.InteropServices.COMException was unhandled
  ErrorCode=-2147221231
  Message=The server is not available. Contact your administrator if this condition persists.
  Source=Microsoft Outlook
  StackTrace:
       at Microsoft.Office.Interop.Outlook.NameSpaceClass.Logon(Object Profile, Object Password, Object ShowDialog, Object NewSession)
       at tryOutlook2010.Form1.Button1_Click(Object sender, EventArgs e) in d:\users\kent\documents\visual studio 2010\Projects\tryOutlook2010\tryOutlook2010\Form1.vb:line 7
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
       at tryOutlook2010.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException:

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motokentAuthor Commented:
Thanks.
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