XADM: How Advanced Security Works on a Mailbox
Article ID: 184226
Article Last Modified on 10/28/2006
APPLIES TO
- Microsoft Exchange Server 4.0 Standard Edition
- Microsoft Exchange Server 5.0 Standard Edition
- Microsoft Exchange Server 5.5 Standard Edition
This article was previously published under Q184226
SUMMARY
Microsoft Exchange Server supports three encryption algorithms: CAST-64,
DES, and CAST-40. The level of encryption is determined by the Exchange
and/or Outlook client, not the server. The U.S./Canada version of all
Microsoft Exchange Client products supports all three algorithms, but
defaults to CAST-64. All other international (localized) versions of
Exchange Client support only the CAST-40 (40 bit) algorithm.
MORE INFORMATION
When you are using a CAST-64 or DES client, Exchange sends the message
based on the encryption information in the mailbox or individual mailboxes
that it is sending to. The CAST-64 and DES clients can read all encrypted
mail.
When you are using a CAST-40 client, the directory for that mailbox is
updated so that other users will send only 40-bit encryption. While you are
logged on to the CAST-40 client, you can not read messages encrypted with
CAST-64 or DES encryption.
Keywords: kbinfo KB184226