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UTS Service Catalog

Your MAC ID is your user name, a unique, common identifier enabling single sign-on for a number of McMaster systems and applications. Your MAC ID is not your employee or student number. If you are unsure if you have a macid, it is generally, the first part of your email address before the @ symbol. Alternatively, you may use the Forgot your MAC ID tool to recover your MAC ID.


You are required to change your MAC ID password every year. Changing your password requires that you clear the saved passwords on your computer. Please see the Clearing Saved MAC ID Password Guide for instructions. Your MAC ID password is yours to keep secure. Do not share it with anyone.


Getting Started

Obtaining and Activating Your MAC ID

  • All employees and students have been provided with a MAC ID.
  • Faculty, Staff and Students must activate their MAC ID to establish a password and provide challenge questions and answeres. Your MACID can be activated at the MAC ID activation tool
  • You must have your employee/student # and your corresponding barcode in order to activate your MAC ID.

Activate Your McMaster E-mail Account

  • Students and employees are required to also activate their McMaster email accounts. Your MAC ID must be active to be able to activate your email account. Students are eligible activate their email accounts on the day after they have enrolled in classes. Employees may activate their email accounts on their official start date.
  • To activate your email account:
    • Please go to https://mosaic.mcmaster.ca select the "Navigator" in the top right corner of the screen.
    • Click on Macid and Email Management.
    • Select the Activate Button, then save.
    • Please note that your account may not be fully functional for 24 hours.

Ongoing Maintenance