Interop Outlook - Create MSG in Windows Service

What I am trying to do - is create an Outlook MSG file via a windows service - I have the below, but on the SaveAs - I keep getting an error:

ystem.Runtime.InteropServices.COMException (0x80004004): Operation aborted (Exception from HRESULT: 0x80004004 (E_ABORT))
   at Outlook._MailItem.SaveAs(String Path, Object Type)

Here is my code:

Outlook.Application objOutlook = CreateInstance();
Outlook.MailItem mic = (Outlook.MailItem)(objOutlook.CreateItem(Outlook.OlItemType.olMailItem));
                                        mic.HTMLBody = "";

mic.SaveAs(@"\\DATA23\pdecat\test.msg", Outlook.OlSaveAsType.olMSG);