In order to login to your student email for the first time, please go to http://live.com . Your windows live ID is your student email username firstname.lastname@mail.citytech.cuny.edu and the password is your date of birth in a 6-digit format follow by the last four of your social security number (MMDDYY + last 4 of social).
If you have any further questions feel free to contact the Student Helpdesk at 718-260-4900, or come by the Information counter (outside of the cafeteria on the first floor of the Namm building).