Exchange Online – Get total size of all mailboxes

By Roland Ehle on 27. May 2020 • ( 6 Comments )

Wouldn’t it be good to have an easy way to get the total size of all mailboxes you host in Exchange Online? Yes?

Challenge accepted! Using the new Exchange Online PowerShell module V2, it is a simple 1-liner. The following command will give you the sum in Megabytes:

((get-exomailbox -ResultSize Unlimited | get-exomailboxstatistics).TotalItemSize.Value.ToMB() | measure-object -sum).sum

Categories: Microsoft 365, PowerShell

Tagged as: English, Exchange, Microsoft 365, PowerShell

Published by Roland Ehle

I am working with Office 365 daily, especially planning and supporting migrations into the cloud. Managing Office 365 without some Powershell knowledge is impossible. View all posts by Roland Ehle

6 replies »

Randy says:

16. November 2021 at 7:45

Does this include the size of the Online Archives?

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LE CORRE says:

4. November 2021 at 9:58

hello,

What can be the command to have total item count for all mailboxes ?

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Anton says:

17. June 2021 at 12:27

Hi,

Thanks for the script,

But unfortunately, I’m getting the below error:

You cannot call a method on a null-valued expression.
At line:1 char:1
+ ((get-exomailbox -ResultSize Unlimited | get-exomailboxstatistics).To …
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : InvokeMethodOnNull

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Ed says:

30. December 2020 at 13:10

Hello! If i want know size for mailboxes fom CSV file ?

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- Patrick Gruenauer says:
  
  1. January 2021 at 18:40
  
  Use the Export-Csv cmdlet. Best, P
  
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