When you try to changeĀ or edit some settings of user mailbox by using Exchange Control Panel (ECP) or running Set-Mailbox Exchange Management Shell cmdlet as an administrator, you receive the following warning message:

WARNING: Please update UseDatabaseQuotaDefaults to false in order for mailbox quotas to apply.

Note This issue only occurs in Microsoft Exchange Server 2016 that has cumulative update 5 installed.


This issue occurs because mailbox quota properties aren't handled well.


To fix this issue, install Cumulative Update 7 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.


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


Learn about the terminology that Microsoft uses to describe software updates.

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