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Microsoft Exchange Server provides a variety of ways to keep your system secure. This chapter describes the different aspects of security and how they work.

There are four aspects of security within Microsoft Exchange Server, as follows:

Windows NT Server security   Identifies and validates users when they log on.

Access control (permissions)    Grants users the permission to access resources.

Auditing   Detects and logs security-related events.

Microsoft Exchange Server advanced security   Enables users to encrypt messages and provides verification of the originator by associating a digital signature with the message.