"Unspecified Error" saving changes to CDO.Message item

I have adapted the code below from a sample given by Glen Scales at OutlookExchange.com.  I had several errors using his code verbatim and slowly whittled it down to this.  However, I am still getting an error on the line msgobj.DataSource.Save.
The gist of the code is to check each message in the given Public Folder for attachments, save the attachments to a file system folder, remove the attachment from the message, add a small ICO file attachment back to the message and then to embed a link to the original file attachment in the message body.

Dim Rec,Rs,strURLInbox,msgobj,msgobj1,flds,objArgs,strView
cfpath = "file://./backofficestorage/domain.COM/PUBLIC FOLDERS/Cases/~Test Client" & cfpath
Set WshShell = CreateObject("WScript.Shell")
Set fso = CreateObject("Scripting.FileSystemObject")
Set Conn = CreateObject("ADODB.Connection")
Set Rs = CreateObject("ADODB.Recordset")
Conn.Provider = "ExOLEDB.DataSource"
Conn.Open cfpath
strView = "SELECT ""DAV:href"""
strView = strView & " FROM scope ('shallow traversal of """& cfpath & """') "
strview = strview & " WHERE ""DAV:isfolder"" = false and ""urn:schemas:httpmail:hasattachment"" = True and ""DAV:contentclass"" = 'urn:content-classes:message' "
rs.CursorLocation = 3 'adUseServer = 2, adUseClient = 3
rs.CursorType = 3
Rs.Open strView, Conn, 2
If Rs.RecordCount <> 0 Then
      Rs.MoveFirst
      While Not Rs.EOF
            if err.number <> 0 then
                  rs.movenext
                  err.clear
            end if
            svcdir = "C:\temp\~Test Client"
            savepath = svcdir & "\"
            if not fso.folderexists(svcdir) then
                  set fldr = fso.createfolder(svcdir)
            end if
            Set msgobj = CreateObject("CDO.Message")
            msgobj.DataSource.Open rs.fields("DAV:href").value, ,3
            attachcount = msgobj.attachments.count
            Redim attarray(attachcount)
            Redim attnarray(attachcount)
            arrcnt = 1
            For Each objAttachment In msgobj.Attachments
                  If Instr(objAttachment.FileName, ".") > 0 Then
                        attname = Left(objAttachment.FileName, InStrRev(objAttachment.FileName,".") - 1)
                        attext = Mid(objAttachment.FileName, InStrRev(objAttachment.FileName,".") + 1)
                  Else
                        attname = objAttachment.FileName
                        attext = ""
                  End If                              
                  rtime = Replace(msgobj.ReceivedTime,"/","-")
                  rtime = Replace(rtime,":","-")
                  savefile = savepath
                  savefile = savefile & attname & " (" & rtime & ")." & attext
                  If attname <> "Paperclip" AND attext <> "ico" Then
                        On Error Resume Next
                        objAttachment.SaveToFile savefile
                        On Error Goto 0
                        attarray(arrcnt) = savefile
                        attnarray(arrcnt) = objAttachment.FileName
                        arrcnt = arrcnt + 1
                  End If
            Next
            If attname <> "Paperclip" AND attext <> "ico" Then
                  If Err.Number = 0 Then
                        msgobj.Attachments.DeleteAll
                        msgobj.AddAttachment "C:\Program Files\Exchsrvr\BIN\Paperclip.ico"
                        If msgobj.HTMLBody <> "" Then
                              If Instr(1, msgobj.HTMLBody, "</BODY") > 0 Then
                                    sHTMLBody = Left(msgobj.HTMLBody, Instr(1, msgobj.HTMLBody, "</BODY>") - 1)
                              Else
                                    sHTMLBody = msgobj.HTMLBody
                              End if
                        End If
                        For I = 1 to attachcount
                              msgobj.TextBody = msgobj.TextBody & vbCRLF & "****** Attachment: " & attnarray(i) & " <file://" & attarray(i) & ">"
                              sHTMLBody = sHTMLBody & vbCRLF & "<BR><B><DIV><FONT face=Arial color=#004000 size=2>****** Attachment: <A href=" & chr(34) & " file://" & attarray(i) & chr(34) & "> " & attnarray(i) & "</A></DIV>"
                        Next
                        If msgobj.HTMLBody <> "" Then
                              msgobj.HTMLBody = sHTMLBody & "<BR><BR></BODY></HTML>"
                        End If
                        msgobj.TextBody = msgobj.TextBody & vbCRLF & vbCRLF
                        msgbox msgobj.datasource.isdirty
                        msgobj.DataSource.Save    'error occurs here
                  End If
            End If
            Set msgobj = Nothing
            rs.MoveNext
      Wend
End If
Set rs = Nothing
Set conn = Nothing
Msgbox "done"

The error I get is:
Error: Unspecified Error
Code: 80004005
Source: CDO.Message.1

Ive tried just removing the attachment and saving, just adding an attachment as saving and just altering the text of the message body and saving.  I still get the same error each time (a hearty THANK YOU to MS for such descriptive error message btw).  Also, another strange thing is that when I check the IsDirty property of DataSource it says False?  Any thoughts or ideas?