Get-Mailbox returns incorrect value for the UseDatabaseRetentionDefaults property in an Exchange Server environment


The mailbox database RetainDeletedItemsUntilBackup value shows as true after you run the following two commands in a Microsoft Exchange Server environment:

  • Set-MailboxDatabase -Identity MailboxDatabase -RetainDeletedItemsUntilBackup:$true

  • Set-Mailbox -Identity Mailbox -UseDatabaseRetentionDefaults:$true

However, when you run the Get-Mailbox cmdlet and view the UseDatabaseRetentionDefaults value, it shows that the value is false.


This issue occurs because the UseDatabaseRetentionDefaults property of a mailbox is displayed incorrectly as false when the administrator has set the RetainDeletedItemsUntilBackup property on the mailbox database to true.


To verify that this value is set correctly, run the following command in Exchange Management Shell (EMS): 

Import-Module ActiveDirectoryThen, run the following command in EMS, and check that the mDBUseDefaults value is true:

Get-ADUser Alias -Properties mDBUseDefaults


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about the UseDatabaseRetentionDefaults and RetainDeletedItemsUntilBackup parameters, go to the following Microsoft website:

General information about the Set-Mailbox cmdletFor more information about theSet-MailboxDatabase cmdlet, go to the following Microsoft website:

General information about the Set-MailboxDatabase cmdlet

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