I uninstalled WLM 2011 on my desktop and installed WLM 2012. My emails open up to the side which I don't like at all. 

There's my list of folders; to the right of that my list of recd. emails and then to the right of that is where the email opens, so it squashes everything close together and for me makes things hard to read. I thought this was a quirk of the 2012 version I'd just have to live with.

So then I did the same thing on my laptop; uninstalled 2011 and installed 2012. On the laptop everything is working as normal with the email opening in a new window.

Does anyone know what's going on? Why is the same program working differently on two computers with the same operating system?