When you log in to http://unimail.hud.ac.uk you must use the alumni link on the page, to go to the Microsoft login screen. Enter your login name as firstname.lastname@example.org for some important information for former students.
If you had a email@example.com address, then this will still exist, allowing emails sent to this address to be received. The primary address, from which mail is sent, will now be firstname.lastname@example.org.
If you want to change your password, then please use the password change facility within UniMail/Office365. If you try to change your password using Microsoft's password reset facility, the University has to verify your request by contacting you on an alternative email or phone. Unfortunately, if we don't have your current details, we won't be able to contact you to complete the procedure. So, if you have attempted a password reset, but not heard back, please email email@example.com explaining the situation.
If you have problems please contact firstname.lastname@example.org