This is a steps How To Configure Exchange Email Account in Outlook 2007
Example : We will configure it in Windows XP client.

Click Start >> Control Panel >> Mail

You will see a screen like below :

Click Show Profiles and you will see a next screen below :

Click Add button to the next page 

Input your Profile Name.
EX : wowtutorial exchange 2007

Click OK to continue

Give a check in Manually configure server settings or additional server types
Click Next to continue.

Click radio button Microsoft Exchange and click Next to continue

Input your microsoft exchange server.
Example : exchange.wowtutorial.local

Input your username
Example : sentono

Click More Settings button

Click OK to continue

Click Connection Tabular
Click a check box Connect to Microsoft Exchange using HTTP
Click a Exchange Proxy Settings... button

Input your https ://
Example : exchange.wowtutorial.org

Click Drop Down Proxy authentication settings and choose Basic Authentication
Click OK

You've done configured your outlook 2007.

Next.. Click Outlook button in your toolbar

You will see a choose profile screen below :

Choose your profile.
Example : wowtutorial exchange 2007
Click OK

 You will see a login screen above.
Input your username. Example : domain\username

Ex : wowtutorial\sentono

Input your username password.
Click OK to continue.

You will need to wait for few second depend on your internet connection to download/ syncronize your outlook client with exchange server. After that you can just try to send/receive your email with your outlook client.