On May 11, 2021, Microsoft released a set of security updates to address a set of vulnerabilities in Exchange Server. These issues were responsibly reported by security partners and found through Microsoft’s internal processes. These vulnerabilities mainly affect on-premises Microsoft Exchange Server, including servers used by customers in Exchange Hybrid mode.
To help protect companies from evolving security threats and malicious activity, We recommend to take action to harden Exchange Server to against the unpredictable attacks and apply the security updates as soon as possible for maximum protection.
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