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University email addresses will change between December 26 - 28

November 29, 2022

To: All individuals with an email address

All university email addresses will be updated from “” to “” over the mid-year holiday break. This update will begin at 10 a.m. on Monday, December 26 and due to the complex nature of this change, it may take up to 48 hours for all university email addresses to change to “”.  

Possible service disruption during the email change 

CCS has scheduled the change to university email addresses for the mid-year winter break as we anticipate lower university email usage during this period. Users should still be able to access their university email account during this period to send and receive emails, however there may be some disruptions:

  • You may experience service disruptions, such as being logged out of your university email account unprompted.
  • If you’ve logged out of your university account, you may not be able to log back in until the change is complete or you may be presented with an error message stating that you are not authorized to log in. This issue is expected and will be resolved once the change is complete.

Please note that if you need to access Google Workspace core apps like Gmail, Drive, Calendar or Contacts between December 26 -28 , we are unable to guarantee consistent or uninterrupted service. We appreciate everyone’s patience during this time of transition.’s Self Service unavailable December 26 - 28

While email addresses are being changed, users will be unable to access the Self Service section of the portal. Users will be unable to update their personal information, reset their password, implement two-factor authentication and other Self Service functionalities until the change is complete.

Some TMU web applications will be temporarily unavailable following this change

Once university email addresses have been changed, CCS may need to temporarily restrict access to some TMU web applications like D2L Brightspace and IT Help for limited periods of time over the mid-year winter break to reconfigure them to the new university email addresses. You will receive a follow up email in December confirming dates for when these web applications will be temporarily unavailable.

What actions will I need to take?

No action will be required on your part to switch over your existing email address to “” and any emails sent to your previous address will continue to be delivered to your new address after the email change. Your inbox will still contain all previous emails that were addressed to your “” email address, and your Calendar appointments and Google Drive files will remain intact.

Users who had remained logged into their university account may need to refresh their browser sessions on computers or mobile devices where they are using the Gmail app in order to begin sending emails from their new “” email address.

Additionally, we recommend that you notify contacts who are outside of the university about your new email address. 

Users using email clients will need to reconfigure their clients

If you use an email client like Microsoft Outlook, Mozilla Thunderbird or Apple Mail to access or manage your university emails, you will be unable to access your emails via the client until you manually update your new “” email address within the client itself.

Be aware of impacts on some Gmail features, Google Workspace and third-party apps

With this change, some features in Gmail and other Google Workspace apps will require you to manually review and update some settings and configurations. Similarly, some third-party apps will require you to reauthorize permissions following the change to email addresses to retain access to connected files or data or require you to contact the app vendor to inform them of the change to your email address.

Learn more about the impact of this change on Gmail, Google Workspace and third-party apps.


If you have any questions, please contact the Computing and Communications Services (CCS) Help Desk via the IT Help portal, or 416-979-5000, ext. 556840 (students) or ext. 556806 (employees).