Google Message Archiving Microsoft Exchange Journaling Configuration Guide For Exchange Server 2007 and 2010 - Manual (Page 13)

Introduction to Microsoft Exchange Server 2007 and 2010 Journaling 15
Adjust Email Storage Restrictions
Because journaling email messages can increase the message load on your
Exchange Server (approximately 15%, according to Microsoft), you might want to
set tighter restrictions on the amount of messages users can store or the duration
for which users can store messages on your Exchange Server. The performance
gains from these restrictions can compensate for the additional load created by
journaling.
The impact of tighter storage restrictions on your users is largely mitigated when
you provide your users with access to the Personal Archive in Message Center.
When messages are stored in the Personal Archive, there is no longer a need to
store them on your Exchange Server. For more information about the Personal
Archive, refer to the Message Archiving Administration Guide.
Create Email Accounts for Users with Search and Discovery
Privileges
Users who have privileges to search your corporate archive or to run
investigations of your corporate archive can also export archived messages by
sending them to their email addresses. If such a user has an email account for
which journaling is enabled, a copy of each message that the user exports to his
or her email address is then journaled and archived again.
To avoid re-archiving messages exported from the archive as attachments, you
can create an additional, separate email account on your Exchange Server for
each user who has access to your corporate archive. Place these accounts in a
separate mailbox database that is exempt from journaling. For example, you can
place these accounts in the same mailbox database as the journal recipient
mailbox (see “Plan Your Journaling Mailbox Deployment” on page 13).
Ensure that you add these new email accounts to your Message Security service,
and place them in an organization for which you turned on archiving. Then grant
the Archive Search privilege (and optionally, the Archive Discovery privilege) to
each account’s authorization record. For instructions on setting up organizations
and granting Message Archiving privileges, refer to the Message Archiving
Administration Guide.
Note: If users with the Archive Search and Archive Discovery privileges will only
export message from the archive by downloading them to a file rather than
sending them as attachments to their email addresses, you do not need to set up
separate accounts for them. Messages that users download to a file are not re-
archived.
Set Up TLS on Your Server
Message Archiving supports TLS (Transport Layer Security) encryption, providing
you with an option to enhance the security of your outbound journaled email
messages. The TLS protocol over SMTP is a certificate-based authentication
method that provides security-enhanced data transfers by using symmetric
encryption keys. Using TLS, however, is not required.