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CISA and the National Security Agency collaborated with international cybersecurity partners to develop Microsoft Exchange Server Security Best Practices, a guide to help network defenders harden on-premises Exchange servers against exploitation by malicious actors.
Organizations with unprotected or misconfigured Exchange servers remain at high risk of compromise as threat activity targeting vulnerable Exchange servers, including versions that have reached end-of-life, persists.
Best practices include a focus on hardening user authentication and access, ensuring strong network encryption, and minimizing application attack surfaces. Organizations that implement these practices can significantly reduce their risk from cyber threats.
