Automating an Outlook button

Running Outlook 2007 on a Windows 7 32-bit platform, I have a button on the toolbar which activates a VB script to add a suffix to recipients Email address.  The button's default condition is OFF, until it is pressed. and it resets to OFF when Outlook is first launched.  I wonder if there is a way to set the default condition to ON?
Here is the code.  Please be aware that I am not the author of this code and I'll need specific instructions if it is to be amended...

 

Sub ToggleAddSuffix()
    bolAddSuffix = Not bolAddSuffix
    MsgBox "AddSuffix is now " & IIf(bolAddSuffix, "ON", "OFF"), vbInformation + vbOKOnly, "Toggle Add Suffix"
End Sub