Hi everyone,
I just thought to make something clear for all those like me that don't have a clear picture on the Exchange Online service in the Office365 suite.

As Microsoft does not provide IMAP support in Outlook.com email accounts yet, I was looking for a way to have an Exchange integration onto an Outlook.com email account in order to sync messages on more devices.
More posts seemed to give the idea that the only chance to have anything different than POP in Outlook.com (at today) was to have Exchange Online service and have sort of "upgrade".
Well Microsoft Exchange Online service does provide indeed exchange support, but to get that benefit you need to register your own domain and then configure your email accounts as exchange.
Therefore if you like the all new Outlook.com email but like me you can't rely upon the POP protocol to work with, purchasing the Microsoft Exchange Online service won't make the trick. 

By the way, i had the chance to look into Exchange Online for a couple of days and i have to say it has a pretty clear and easy to use interface, even for somebody like me who's not an IT person.