The ITSC will create Office 365 mail accounts for new staff reporting duty on or after 1st April 2017.
For information about passwords, account deletion and retention policies, please refer to http://www.itsc.cuhk.edu.hk/en-gb/all-it/accounts-and-access/staff-student-account
Links:
O365 Email Web Access
http://outlook.office365.com
Changing @cuhk.edu.hk email alias
https://cai.itsc.cuhk.edu.hk/alias/Login
Changing email password
https://www.itsc.cuhk.edu.hk/all-it/accounts-and-access/staff-student-account#tab_2
Changing email display name
https://cloud.itsc.cuhk.edu.hk/adprofileupdate/login.aspx
Setting up email on your devices
https://www.itsc.cuhk.edu.hk/all-it/email-messaging-and-collaboration/office-365-mail#tab_2