Be careful with outlook.com. I had high hopes for it as I wanted to migrate away from Gmail. However, like many others I found out the hard way that outlook.com has many problems. First, it will only "reliably" accept about 1500 contacts, the rest of which will not sync. This is not a problem for me since I do not have that many but for many it is. For me the biggest issues are that outlook.com has a character limit in the contact's notes field of about 1250 characters so many of my Gmail notes get truncated. Also there is problems if you create a contact in Outlook 2013 that when it syncs to outlook.com the notes field is filled with HTML garbage even if there was nothing in the original notes field.
I realize all of these problems are with the contacts (now called People), and that you are referring to switching to email, but an email program is no good without a good contact list.
Wow! Thanks. I did not know that. I was just going by the USX of Outlook.com.