@Link Email

Students can use @Link, an email service under CUHK Microsoft 365, to stay connect with the University. With opt-in procedures done, you can even use it after your graduation. This service is provided based on Microsoft Campus Agreement.

Available to

Students, student organizations, projects, alumni association & alumni with CUHK University Degree or above qualifications, including Postgraduate Diploma in Education Programs (PGDE)

Service Charge and Application

Students: Free; no application required
Alumni: Free; opt-in procedures required
Organizations / Projects: Apply the service through the related account application

Access to Service

CUHK Microsoft 365 Portal: http://www.cuhk.edu.hk/o365
Login ID / Password: please refer to Log in through CUHK Login Page

Service Availability

24 X 7 ; except maintenance period


Size Restriction on each Message (including attachments): 25MB

For Students,

  • Mailbox Valid until: student account expiry + 30 days, except opted-in for alumni email service
  • Display Name: Your name in CUSIS
  • Default Email Address: Student-ID@link.cuhk.edu.hk
  • Another Email Address:


Graduates can opt in to use the service below after graduation:

  • @Link email
  • OneDrive for Business
  • Online version of Word, Excel and PowerPoint (However, the Microsoft Office downloaded on your PC or notebooks will gradually support read-only mode)

Service will be automatically available 1 working day after the opt-in.

Note: ITSC will send an email reminder about your student account expiry before your graduation. Your mailbox and OneDrive files could be kept only if you complete the steps below before your Microsoft services are expired.

Opt-in Procedures Before Graduation

  • Students who become CUHK alumni in 90 days can complete the opt in procedures before graduation in order to retain the emails and files in OneDrive for Business
  • One must have alias for @Link defined before the opt-in


Opt-in Procedures After Graduation


ITSC supports the online opt-in process while Alumni Affairs Office supports the service for alumni.


ITSC had coordinated and communicated with the student organization account users in 2017 to prepare for the switchover from the old email email, CUHK Webmail, to @Link. The switchover exercise included

  1. An @Link mailbox was offered to the student organization with other cloud services e.g. OneDrive, and collaborative tools available for students.
  2. A new email address = alias@link.cuhk.edu.hk (if defined) / computing-id@link.cuhk.edu.hk was created, which was also the reply-to email address / sender email address.
  3. Student organizations could use computing-id@link.cuhk.edu.hk & OnePass password to log in @Link mailbox.
  4. If student organization had defined email address as alias@cuhk.edu.hk which was published in different publications, to avoid email loss, any new emails reaching that email address would be forwarded to @Link. However, in a long term, those student organization should publish their new email address alias@link.cuhk.edu.hk instead.
  5. If student organization had never defined its email address i.e. email address = computing-id@cuhk.edu.hk, it became invalid on 3 Jan 2018.


Questions below have been frequently asked:

  • Mail Size, Receiving/Sending Limit and General settings?
  • Mail Folders, Suspected Mail Lost and Blocked attachments in Outlook?
  • Forwarding and Auto-Reply settings?…And more

Please click here for the full version of FAQs.