Exchange server address: SLUGPEXMC21.central.det.win
Username: DET portal username, with “@det” appended
Authentication user name: DET portal username “@det” appended
Password: DET portal password

Connect to Microsoft Exchange using HTTP
URL: oa.det.nsw.edu.au
Connect using SSL only
Only connect to proxy servers that have this principal name in their certificate: msstd:MyEmail.det.nsw.edu.au
On slow networks, connect using HTTP first, then connect using TCP/IP
Proxy authentication settings: NTLM Authentication.

Source: NSWCEG