Configuring Exchange 2007 accounts with Apple Mail 5, Contacts and iCal (bundled with OS X 10.7 Lion)

Go to System Preferences

Go to Mail, Contacts & Calendar

Select Microsoft Exchange

Fill in your Full name, your Email Address and your domain password

You will be prompted to verify certificate. You can ignore this for now and hit continue.

verify certificate warning

Replace the User name with your CAIR\ domain credentials. The Server address is weboutlook.du.edu.

lion exchange setup

You will receive a confirmation screen.

Select the services you want to synchronize.