Go to the upper right corner where you will find a nut. You are clicking and go to "more settings of mail"
Here you will see a variety of options. What interests us, however, Rename your email address.
Read the warning (which specifies that it is good idea to change if we use email to set up Windows Phone, because we have to restore factory settings).
If you have no problem, just write your new user name, and see that now your Hotmail account will become one of outlook.com, transifriendo previous contacts and emails. In addition, you can keep the old account (hotmail) in a separate folder, but both emails work as if one:
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