http://msdn.microsoft.com/en-us/library/microsoft.office.interop.word.document_members(v=office.15).aspx
http://www.codeproject.com/Questions/630569/how-to-send-email-using-word-mailmerge-in-Csharp
http://msdn.microsoft.com/en-us/library/ms268749.aspx
http://msdn.microsoft.com/en-us/library/Microsoft.Office.Interop.Word(v=office.15).aspx