Kent,

After a little modification to get the appending the way that I wanted, I was able to get this work successfully in our environment. It works for both Windows XP w/Outlook and Vista Users. Here is the scrubbed code:

 Code:
:nk2
Dim $servername, $default, $appd, $profilepath, $searchstring, $sharepath, $programpath, $cmdstring, $runline, $rc, $line
 ;*********Edit Variables*****************
 $iteration = A1
 $yr=@year
 $mo=Right(100+@monthno,2)
 $md=Right(100+@mdayno,2)
 $servername = server1
 $profilepath = %appdata%\Microsoft\Outlook\
 $searchstring = "username@@domain.com"
 $sharepath = "\\" + $servername + "\nk2view\"
 $programpath = $sharepath + "nk2view.exe"
 ;***************************************
 If Not Exist($profilepath)
    $profilepath = "%USERPROFILE%\Application Data\Microsoft\Outlook\Outlook.NK2"
 EndIf
 If Exist("%SYSTEMDRIVE%\SHARENAME\*.bak*")
       Return
     Else
   If Exist($profilepath+'*.nk2')
       Copy $profilepath+"*.NK2" "%SYSTEMDRIVE%\SHARENAME\*.bak"+"_"+$iteration+"_"+$yr+$mo+$md
       $rc=WshPipe('%comspec% /c dir /b "'+$profilepath+'*.NK2"',1)
       For Each $line in $rc
          If Not InStr($line, "File Not Found")
             $cmdstring = $programpath + ' /nk2file "' + $profilepath+$line + '"'
             $runline = $cmdstring + ' /delete ' + $searchstring
             Shell $runline
          EndIf
       Next
     EndIf
 EndIf

;************************************************************************************
  Function WshPipe($shellcmd, OPTIONAL $noecho)
       Dim $oexec, $output
       $oexec = CreateObject("WScript.Shell").exec($shellcmd)
       If Not VarType($oexec)=9 $wshpipe="WScript.Shell Exec Unsupported" 
             Exit 10 
       EndIf
       $output = $oexec.stdout.readall + $oexec.stderr.readall
       If Not $noecho $output 
       EndIf
       $wshpipe=Split(Join(Split($output,Chr(13)),''),Chr(10))
       Exit($oexec.exitcode)
 EndFunction
Return


We had challenges with the following value because this value wasn't what the default location is supposed to be for Vista - Outlook users.
 Code:
$appd = ReadValue('HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders', 'AppData')


For one user, we would verify via the Registry Editor and it was a different value than what you would get at the command line using "set" or Start | Run %appdata%. It was kind of weird, so we decided to use %appdata%\Microsoft\Outlook\