Steps to start using Microsoft Teams:
1. Go to https://teams.microsoft.com/downloads.
2. Click Download for Desktop.
3. Type your HKU email address (portaluid@hku.hk) and click Next.
4. Type your HKU email address (portaluid@hku.hk) and HKU Portal PIN and click Sign in.
5. Next time you can open the Microsoft Teams client to use it.