Office 365 Mail

Office 365 Mail

Office 365 Mail is a central email service for all staff members. It provides each user a 50GB mailbox. The service replaces CUHK Webmail (Mailserv) system which will retire on 3 Jan 2018.

Available to


Service Charge and Application

Staff: Free; no application required
Project / Department: Apply the service through project / department account application

Access to Service

CUHK Office 365 Portal:
Login ID: Your email address (Check out my email alias)
Password: OnePass (CWEM) Password

To send emails via Gmail, check Tab 2 Using Office 365 Mail via Your Device / Other Email Service here for a correct setting. Otherwise, mails sent from you might be classified as Junk.

Service Availability

24 X 7 ; except maintenance period


1. Mailbox & Email Address

Email Address Define your email address* here (via campus network / CUHK VPN) – How to define?

* Staff email address is standardized (details).

Email Drop Box (unchangeable)
Display Name It includes standardized display name, email address and contact phone viewable to all staff. Change it here and it will be updated to

  • Office 365 in 30 minutes (Choose Delve in Office 365)
  • Global Address List in 24 hours (click New Email and Address Bookat Outlook)
Mailbox Size 50GB
Max. Size of Each Email 25MB
Validity Until the contract end date

2. Using Office 365 Mail via Your Device / Other Email Service

Here are quick guides for you to check emails or access your mailbox across devices and other email services.


3. 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.