Thank you.  The code works great.  

Further follow-up questions: (1) Is there code that can
be added instructing/prompting the user to save the new
document under the name and to the file of their choice?;
(2) Alternatively, what code would be required to
automatically save the code to a file located on the C
drive named, for example,"CurrentDrafts"; and (3) After
adding code to my main merge documents, Each time they
open, I get the Message Box indicating the document
includes macros and asking if I want to enable or disable
them.  My inclination is to simply reduce the security
level so that this message doesn't appear.  If I reduce
the security for this one document, will that reduce the
level of security fall Word documents?  Is there a better
way to deal with this?

Thank you again

Jim

Using

Sub AutoOpen()
Dim maindoc as document
Set maindoc = ActiveDocument
maindoc.MailMerge.Execute
maindoc.Close wdDoNotSaveChanges
ActiveDocument.Save
End Sub

Will cause the File Save dialog to appear after the merge has been executed.

DO NOT reduce the security level below Medium.

You could avoid the macro warning if you change the macro name to AutoNew
and save the mailmerge main document as a Template in the User or Workgroups
template directory and then use File>New and select the template rather than
File>Open.