Configuring Security

Choose the Security Message Format

Outlook 98 or later versions support S/MIME. This format is used for sending secure messages over the Internet. S/MIME is standardized and compatible with other message security systems across the Internet, utilizing X.509 version 3 certificates. This is the industry-standard certificate issued by Server Certificate Authority.

Outlook 97 and older clients are still supported by KMS in Exchange 2000.

Note   For communication outside of North America, Outlook 97 or older clients can use the CAST-40 algorithm, part of the Exchange 4.0/5.0 proprietary security model. Outlook 98 and Outlook 2000, which support S/MIME, use the RC2-40 algorithm.

To determine the security message format for your users:

  1. Start System Manager
    On the Start menu, point to Programs, point to Microsoft Exchange, and then click System Manager.
  2. In the console tree, double-click Advanced Security.
  3. In the details pane, right-click Encryption Configuration, and then click Properties.
  4. In Encryption Configuration Properties, click the Algorithms tab.
  5. If all of the computers in your organization are running Outlook 98 or later versions, under Security Message Format, select S/MIME.
  6. If you have older clients in your Exchange under Security Message Format, select Exchange 4.0/5.0.

Related Topics

Select the Preferred Encryption Algorithm for Your Clients