In Microsoft Exchange Server 2019 or Exchange Server 2016, you use the New-MailboxSearch cmdlet to create an In-Place eDiscovery search or an In-Place Hold by setting the InPlaceHoldEnabled parameter to true. All the current property values on the msExchUserHoldPolicies attribute are unexpectedly removed, and then added back if you add a new mailbox search against the same source mailbox.
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