preview pane disappeared!
I don't know how I did it, but with a stroke of the mouse i've managed to get rid of the 'preview pane' that enables me to read an e-mail without opening it (Apple might call it something different, but that's what it's called in Windows).
I've been through preferences and all the menu options, but can't find a way to switch it back on. HELP!
iMac, Mac OS X (10.6.7)