Exchange Server 2019 : Set Quota for Mailboxes2023/02/08

Windows PowerShell
Copyright (C) Microsoft Corporation. All rights reserved.

# run [Exchange Management Shell]
PS C:\Users\exchangeadmin> LaunchEMS 

# show current quota settings
[PS] C:\Windows\system32> Get-Mailbox | Select Name,IssueWarningQuota,ProhibitSendQuota,ProhibitSendReceiveQuota,UseDatabaseQuotaDefaults 

Name                     : Server World
IssueWarningQuota        : Unlimited
ProhibitSendQuota        : Unlimited
ProhibitSendReceiveQuota : Unlimited
UseDatabaseQuotaDefaults : True

Name                     : Exchange Admin
IssueWarningQuota        : Unlimited
ProhibitSendQuota        : Unlimited
ProhibitSendReceiveQuota : Unlimited
UseDatabaseQuotaDefaults : True

Name                     : Ubuntu Linux
IssueWarningQuota        : Unlimited
ProhibitSendQuota        : Unlimited
ProhibitSendReceiveQuota : Unlimited
UseDatabaseQuotaDefaults : True

.....
.....

# for example, set quota for [Server World] mailbox
# IssueWarningQuota : issue a warning at specified size
# ProhibitSendQuota : prohibit send at specified size
# ProhibitSendReceiveQuota : prohibit send and receive at specified size
# UseDatabaseQuotaDefaults : need to set to [False] for custom settings
[PS] C:\Users\exchangeadmin> Set-Mailbox -Identity "Server World" `
-IssueWarningQuota 4gb `
-ProhibitSendQuota 4.5gb `
-ProhibitSendReceiveQuota 5gb `
-UseDatabaseQuotaDefaults $False 

[PS] C:\Windows\system32> Get-Mailbox "Server World" | Select Name,IssueWarningQuota,ProhibitSendQuota,ProhibitSendReceiveQuota,UseDatabaseQuotaDefaults 

Name                     : Server World
IssueWarningQuota        : 4 GB (4,294,967,296 bytes)
ProhibitSendQuota        : 4.5 GB (4,831,838,208 bytes)
ProhibitSendReceiveQuota : 5 GB (5,368,709,120 bytes)
UseDatabaseQuotaDefaults : False