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Setting Deleted Item retention time for mailbox in Exchange 2016 1. Prepare - DC11 : Domain Controller - DC12 : Exchange Server 2. Step by step - DC12 : Change Deleted Item retention time for mailbox's HiepIT to 7 days + Start - Exchange Administrative Center - logon - recipients - mailboxes tab - Double-click HiepIT - mailbox usage : - More options... - Select "Customize the retention settings for this mailbox" : + Keep deleted item for (days) : 7 - Save
