Originally Posted by
gfunkdave
Good call - click the gear icon in the upper right and choose Options. Then click Reading Pane under Mail - Layout. There's an option of whether to type new messages in the Reading Pane or in a new window.
I was able to switch it, but was also required to change the reading pane style to the column style, rather than messages on top, pane on the bottom. I'll probably end up just staying in the Outlook PIM.