@danielpunkass Much better; thanks.
I asked him to try: defaults delete com.apple.mail "NSToolbar Configuration NSPreferences"
@ccgus 10.5.1 doesn't have the lozenge for me. Neither did the builds from the last year or so.
I'm too picky to buy anyone else's code, so it'd have to be something with a cool algorithm worth rewriting.
Customer hid his Mail Preferences toolbar when using Tiger, now is using Leopard which doesn't have the lozenge button to get it back.