Symptoms

After trying to update Exchange mailbox size via Customer Control Panel, the task for changing mailbox size fails:

Task name       Set limits for mailbox 'mailboxname' (id=12345)
Task description        Set limits for mailbox 'mailboxname' (id=12345)
Last execution output   Destination host_id #12 : Provisioning request failed. Unknown error 0x80131500 [<response><errorContext description="Unsupported size format" code="0x80131500" executeSeqNo="2"><errorSource namespace="Exchange2010ProviderEx" procedure="ModifyMailbox"/><errorSource namespace="SW Managed Exchange" procedure="ModifyMailbox"/></errorContext></response>]

Cause

Incorrect size of mailbox is set on Exchange server.

Resolution

  1. Login to Exchange server where mailboxes are stored
  2. Open Exchange Management Shell and check quotas of the problem mailbox using the command:

    [PS] C:\Windows\system32>Get-Mailbox -Identity "Mailbox Owner" | fl ProhibitSendQuota, ProhibitSendReceiveQuota, IssueWarningQuota
    
  3. I the values that you see do not correspond to values specified in POA, then update them using the command:

    [PS] C:\Windows\system32>Set-Mailbox -Identity "Mailbox Owner" -ProhibitSendQuota <value> -ProhibitSendReceiveQuota <value> -IssueWarningQuota <value>
    
  4. Resubmit the failed task.

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