This is the link to activate your institutional mail address: http://mail.office365.com/.
Logging in your page on Esse3 (https://uniparthenope.esse3.cineca.it/) you will find which address is to be put in the previous link. It is in the section “Dati Personali”/”Personal Data”. The email address format is usually name.surname@studenti.uniparthenope.it.
The password for the first access is identical to what you have chosen when you registered in Esse3. If you wish, you can change the password here: http://serviziweb.uniparthenope.it/resetpassword/login.php. In this case, you will need the fiscal code automatically created for you by Esse3 when you first registered. It’ a 16 digits code. Furthermore this link requests to use the same personal address you inserted when you registered (for example, name.surname@pmail.it), so if you wish to receive the password at a personal mail different from that used when you registered in Esse3, first of all you must change it in Esse3.