Specify Exchange network security

This feature requires you to use a Microsoft Exchange account. Most home and personal accounts do not use Exchange.

You can specify a password authentication option when connecting to an Exchange server with Microsoft Outlook. To determine which option to select, consult your network administrator.

  1. On the Tools menu, click E-mail accounts, select View or change existing e-mail accounts, click Next, select the Exchange e-mail account, and then click Change.
  2. Click More Settings, then click the Security tab.
  3. Under Logon network security, select the option you want.


  • Under User identification, you can select the Always prompt for username and password check box to specify that you should be prompted for a user name and password each time you connect to the Exchange server. By default, cached credentials are used for logon. Therefore, you are prompted for a user name and password only when there are no cached credentials, for example, when you try to connect to the server for the first time, or when the server cannot authenticate you using the cached credentials, for example, when you are trying to connect to a different mailbox in the same domain.
  • If you are prompted, you can specify the user name in one of two ways:
    • Your domain name and your user name, separated by the backslash (\) character. For example, sales\user.
    • Your user principal name (UPN), which consists of a user principal name prefix (your user name) and your user principal name suffix (your domain name), joined by the at sign (@). For example, someone@sales.westcoast.example.com. The suffix in this example is a fully-qualified DNS domain name. Your administrator might have created an alternative suffix to simplify the logon process. For example, creating a user principle name suffix of "example" allows the same user to log on by using the much simpler someone@example.com. For more information, see your administrator.
Applies to:
Outlook 2003