.NET application freezes after sending e-mail

[WKK]

Hi,
I am trying to write a VB.NET 2005 application, that should automate word
2003 for sending e-mails.

Right now my application is able to open a document template in Word 2003,
open the mail envelop, fill the mail envelop with data from the application.

The user may then click the send button and the e-mail is sent properly.

After that however my application freezes as well as my Outlook client. In
task manager I can see that Word.exe is still running. After killing
Word.exe my application and Outlook seem to work properly again.

Here is a sample Windows Application that demonstrates the problem:

Option Strict Off

Imports Word = Microsoft.Office.Interop.Word Imports Outlook =
Microsoft.Office.Interop.Outlook

Public Class Form3
Dim oApp As Word.Application

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim sPath As String = "C:\TEMP\"

oApp = New Word.Application

Dim oDoc As Word.Document = oApp.Documents.Open(sPath & "Test.doc")

oApp.Visible = True

oDoc.SaveAs(sPath & "Test1.doc")

oDoc.ActiveWindow.EnvelopeVisible = True

Dim oItem As Outlook.MailItem = CType(oDoc.MailEnvelope.Item,
Outlook.MailItem)

oItem.Subject = "Test"
oItem.To = TextBox1.Text

'oItem.Close(Outlook.OlInspectorClose.olSave)
'oDoc.Close()
End Sub
End Class

The problem is somehow linked to using the Outlook.MailItem property. If not

using the Outlook.MailItem property but filling the mail envelop fields
manually my application does not freeze after pressing the send button.

Am I making anything wrong? Any help would be appreciated.

Thanks,
Wulf