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When you try to move a public folder mailbox, the attempt fails, and the following error message is recorded in the move request report: 

StatusDetail: StalledDueToMRS_Quarantined

Message: Request was quarantined because of following error: Object of type "Microsoft.Exchange.Data.Storage.PublicFolderSession" cannot be converted to object of type "Microsoft.Exchange.Data.Storage.MailboxSession".


To fix this issue, install Cumulative Update 13 or a later cumulative update for Exchange Server 2019.

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