using Mail can't see previews
Once we closed it, we can't seem to lift the split window to view previews of emails from the dot at the bottom bar using classic view in OSX 10 11.6 (or 10.11.4 on another Mac)
iMac 2.66ghz corei5, Mac OS X (10.6.7)
You have to click and hold on the dot and drag it at lease half way up the screen before you let go.
Same applies for the non-classic view, except you have to drag from the righthand side to about the middle of the window.