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The MSExchangeServiceHost service crashes repeatedly and Event ID 4999 is logged in the Windows Application event log. For more information, see the following Knowledge Base article:ĥ014278 Changes in Exchange Server PowerShell cmdlets and Exchange Admin Center for UNC path inputs

To prevent misuse of UNC paths by attackers, parameters that take UNC paths as inputs will no longer be usable in Exchange Server PowerShell cmdlets or the Exchange Admin Center. For more information about DST, see Daylight Saving Time Help and Support Center. This update also includes new daylight saving time (DST) updates for Exchange Server 2016. These fixes will also be included in later cumulative updates for Exchange Server 2016. Cumulative Update 23 for Microsoft Exchange Server 2016 was released on April 20, 2022. It includes fixes for nonsecurity issues and all previously released fixes for security and nonsecurity issues.