Gmail like outlook

We migrated from Outlook to Gmail here at work recently. I love the flat design of Gmail, but I also love the Outlook preview panel on the right when you click on the emails.
So, after a bit of research (and the help of a colleague, thanks Gordon!), I found what I was looking for :

Steps :

1. On the left panel of your Gmail, where you have the list of your labels,  click on the more link.
2.  Now click on Manage Labels link.
3. Here click on the Labs tab.
4. In the "Search for a lab:" enter  preview pane .
5. Click on Enable option.
6. Gmail will reload.
7. On the top right of the screen there will be a new a drop down menu :

8. Choose Vertical Split.
9. Thank me later.