Categories: PowerShell

PowerShell – How to find users without default quota set on Microsoft Exchange

During Exchange 2010 times for one of our Clients some users had special quota set for multiple users that was different than what was default settings in the database. Upon migration to Exchange 2013 and with no space problems the default quota was expanded for everyone making sure everyone has enough space to hold everything. However since some users had their personal quota set that required a fix. Since Exchange 2010, Exchange 2013 and lately Exchange 2016 has that covered with simple PowerShell it's very easy to do this in one go, rather than going one by one thrue Exchange Admin Center (ECP) interface.

📧 Solution

To find users that have non-default quota settings on their mailboxes one can use this very simple PowerShell command

get-mailbox -ResultSize Unlimited | where {$_.UseDatabaseQuotaDefaults -ne $true}

To fix all those users one can simply expand on that command

get-mailbox -ResultSize Unlimited | where {$_.UseDatabaseQuotaDefaults -ne $true} | Set-Mailbox -UseDatabaseQuotaDefaults $true

After executing this and rerunning check again there should be no data returned.

get-mailbox -ResultSize Unlimited | where {$_.UseDatabaseQuotaDefaults -ne $true}

This post was last modified on June 6, 2025 20:29

Przemyslaw Klys

System Architect with over 14 years of experience in the IT field. Skilled, among others, in Active Directory, Microsoft Exchange and Office 365. Profoundly interested in PowerShell. Software geek.

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Przemyslaw Klys
Tags: default quotaecpexchangeexchange 2013exchange 2016mailboxesmicrosoft exchangepowershell
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