"Data in the command exceeded the maximum permitted by the session configuration" error when you run the Get-Mailbox -ResultSize Unlimited command in Exchange Online

PROBLEM
When you use the remote Exchange PowerShell command Get-Mailbox -ResultSize Unlimited to retrieve information about Exchange Online mailboxes in your organization, you receive an error message that resembles the following:
[ClientAccessServer=XXXXXXXXXCA014,BackEndServer=XXXXXXmb294.namprd05.prod.outlook.com,RequestId=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx,TimeStamp=<Date><Time>] The data in the command exceeded the maximum permitted by the session configuration. The allowed maximum is 500MB. Change the input, use a different session configuration, or change the "PSMaximumReceivedObjectSizeMB" and "PSMaximumReceivedDataSizePerCommandMB" properties of the session configuration on the remote computer
CAUSE
This issue occurs when the process times out as it tries to retrieve a large volume of data in one session. This issue may occur when you try to retrieve mailbox information from a very large organization.
WORKAROUND
To work around this issue, run the command to execute on the server, and then add a pause between each command to prevent throttling.

Step 1: Retrieve the list of objects from the server

Use the Invoke-Command cmdlet to execute the commands from the server. For example:
$mailboxes = Invoke-Command -Session (Get-PSSession) -ScriptBlock {Get-Mailbox -ResultSize Unlimited | Select-Object -Property Identity,DisplayName}

Step 2: Add a pause between each command

Use the Start-Sleep cmdlet to add a pause between each object that's being processed. For example:
foreach($m in $mailboxes) {Get-MailboxPermission $m.Identity.ToString() | Where { ($_.AccessRights -eq "FullAccess") -and ($_.IsInherited -eq $False) -and -not ($_.User -like "NT AUTHORITY\SELF")}; Start-Sleep -Milliseconds 500}
MORE INFORMATION
For more information, see the following Microsoft TechNet resources:
Still need help? Go to the Office 365 Community website.
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Article ID: 2922668 - Last Review: 04/20/2016 17:59:00 - Revision: 5.0

Microsoft Exchange Online

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