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You may get this error when your mailbox reaches or exceeds the quota. You can increase the individual mailbox quota by using PowerShell, or via the Exchange Management Shell.

Steps to set the mailbox quota using PowerShell:

  • Connect to Exchange online by using remote PowerShell, for more information about how to do it, please refer the article Connect to Exchange server via PowerShell.
  • Run the below Command

    Set-Mailbox <UserID> -ProhibitSendQuota <Value> -ProhibitSendReceiveQuota <Value> -IssueWarningQuota <Value>

    <User ID> - Replace the place holder with user credentials (email, guid,UPN).
    <Value> - Replace the place holder with the value in MB/KB/GB. Other things are self-explanatory.


    Set-Mailbox -ProhibitSendQuota 24GB -ProhibitSendReceiveQuota 25GB -IssueWarningQuota 23GB


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