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You will also still be able to place mailboxes on Litigation Hold. Using In-Place Holds in Exchange Server and Exchange hybrid deployments will still be supported. You'll only be able to remove them in the EAC or by using the Remove-MailboxSearch cmdlet. However, starting October 1, 2020, you won't be able to manage In-Place Holds.
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But you'll still be able to manage In-Place Holds in the EAC or by using the Set-MailboxSearch cmdlet in Exchange Online PowerShell. Starting July 1, 2020, you won't be able to create new In-Place Holds.
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