@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.

Available to

Students, student organizations, projects & alumni who graduates 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
Student Organizations / Projects: Apply the service through student organization / project accounts application

Access to Service

CUHK Microsoft 365 Portal: http://www.cuhk.edu.hk/o365
Login ID: Student-ID@link.cuhk.edu.hk / Alumni-ID@link.cuhk.edu.hk /  Computing-ID@link.cuhk.edu.hk (for project accounts only)
Password: OnePass (CWEM) Password

Service Availability

24 X 7 ; except maintenance period


1. Email Address & Mailbox Setting

Default Email Address: Student-ID@link.cuhk.edu.hk
Another Email Address: 

Mailbox Size:

  • 100GB for students
  • 50 GB for alumni / student organization / projects

Size Restriction on each Message (including attachments): 25MB
Mailbox Valid until: student account expiry + 30 days, except optted-in for alumni lifelong email service


2. Using @Link via Your Device
3. Opting in @Link for Alumni

Graduates can opt in to use @Link email (50GB)OneDrive for Business, the related collaboration tools and the files stored inside after graduation. ITSC supports the opt-in process while Alumni Affairs Office supports the service for alumni.

Note: Your mailbox and OneDrive files could be kept only if you opt in the service before your Microsoft services are removed. Please refer to the email sent to you from no-reply@cuhk.edu.hk about when your Microsoft services will be removed.

Opt in Procedures

Before Graduation:

  • Opt-in Guide – 
  • 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
    • Must have alias for @Link defined to complete the opt-in


After Graduation:

  • Opt-in Guide –


4. (For Student Organizations) Switchover Exercise from CUHK Webmail to @Link in Year 2017

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.


5. FAQs

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.