How to Configure a Front-End Server to Assume a Default Domain
You can configure a front-end server to assume a default domain so that users do not have to remember their domain.
Before You Begin
Before you perform the procedures in this topic, it is important that you first read Configuring Exchange Front-End Servers.
Procedure
To configure a front-end server to assume a default domain
Start Exchange System Manager on the front-end server. Click Start, point to Programs, point to Microsoft Exchange, and then click System Manager.
Right-click the "Exchange" virtual directory, and then click Properties.
Click the Access tab, and then click Authentication.
Select the Basic authentication check box, and then type the domain in the Default domain box.
Repeat this procedure for the "Public" virtual directory.
Note
Ensure that the System Attendant service is running so that the configuration settings replicate from the directory to the IIS metabase (you can also restart Exchange System Attendant to force replication).