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
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:
Related TopicsSelect the Preferred Encryption Algorithm for Your Clients