Office 365 - Will my old email client (e.g. Thunderbird) work after migration?

No, unless your old email client is re-configured to do so. Configure your email client on your computer or mobile app in mobile device the instruction from Microsoft. When asked for your email address, enter your Network ID followed by "@connect.ust.hk” (for example, tchanaa@connect.ust.hk). Fill in the rest of the settings as shown in the Microsoft instructions.

• Phone and tablet setup reference
• Email program setup reference