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Customize security templates to ensure that application and operating system functionality are not broken or negatively affected.
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Use security templates provided by Microsoft, the National Security Agency (NSA) or the National Institute of Standards and Technology (NIST) as baselines for customizing the organization's security templates.
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Keep servers and client computers up-to-date with the latest service pack and security updates.
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Consult Microsoft, NIST, and NSA security guidelines for securing the operating system.
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Use third-party antivirus software.
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Authenticate clients to the Exchange Server 2003 messaging infrastructure, using Kerberos whenever possible.
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Outlook 2003 users should use Cached Exchange mode if they will be using RPC over HTTPS connections over the Internet.
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Combine Exchange Server 2003, Outlook 2003, and third-party features to combat spam.
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Block all read receipts.
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Implement IRM.
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Use S/MIME to encrypt sensitive or confidential messages.