On user computers, you can configure Internet Explorer so that users are automatically logged on to the Web Access application, without receiving a logon prompt. Essentially, you must configure Internet Explorer so that it trusts the Web Access application computer.
For this to work, you must also be using the Integrated Windows Authentication.
To make Internet Explorer log on automatically, you may need to modify the Internet Explorer Internet Options on each client computer. The settings are saved in the Windows registry, so you can save them for rollout to many client computers.
There are many possible ways for you to configure Internet Explorer security, some of which may not be acceptable to you. The following methods are described here:
See the Internet Explorer help if you need more information on configuring browser security.
On the Windows XP and Vista computers that comply with Federal Desktop Core Configuration (FDCC), you cannot change local intranet zone settings in Internet Explorer. However, you can publish the Enterprise Vault server details to users' computers by modifying the relevant FDCC GPO. Users can then perform Enterprise Vault operations without being prompted for authentication each time.
More Information
Setting up the default authentication for the Enterprise Vault Web Access application
Publishing Enterprise Vault server details to FDCC-compliant computers