I have tried it also and I am not happy with Outlook. Its seems harder to tell what is what at a glance. After getting a bit annoyed with the constant demands to log into a Microsoft Account I went back to 2010. There is not much to encourage 2007 2010 users to upgrade really.
Been using it for a few weeks now. Outlook is all weird and hard to get used to. When you reply to an email it stays in the preview pane unless you opt to pop it out. If you move away from the reading pane you have to go to your drafts to find the email you were writing. I like the LinkedIn integration though. I can actually see the LinkedIn profile picture if the other person has it. It's also faster. Loads quicker.