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Changing mailbox size in Exchange 2016 and Exchange 2019

Changing mailbox size in Exchange 2016 and Exchange 2019
Alex guides us through how to change mailbox size in Exchange 2016 and Exchange 2019.

You can use the Exchange admin center (EAC) or the Exchange Management Shell to change the mailbox storage quotas for certain mailboxes. When a mailbox reaches its specified storage quota, Users receive a notification warning them of the low free space.

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When setting custom settings for Mailbox size. There are 3 options to look at:

change mailbox size 2016

Issue a warning at (GB): Exchange will send a warning message to the user if their mailbox reaches this size.

Prohibit send at (GB): If the mailbox size reaches or exceeds this limit, Exchange will prevent the user from sending any further messages.

Prohibit send and receive at (GB): If the mailbox size reaches this specified limit, Exchange will prevent the mailbox from sending new messages and won't deliver any new messages to the mailbox.


You can also use the Exchange Management Shell to configure storage quotas for a mailbox.

Set-Mailbox -Identity "Joe Bloggs" -IssueWarningQuota 4.5gb -ProhibitSendQuota 4.75gb -ProhibitSendReceiveQuota 5gb -UseDatabaseQuotaDefaults $false

change mailbox size 2016


So, this will set Joe Bloggs’s mailbox limits as:
IssueWarningQuota 4.5gb
ProhibitSendQuota 4.75gb
ProhibitSendReceiveQuota 5gb
UseDatabaseQuotaDefaults $false is needed to set custom attributes

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