Microsoft 365

Exchange Online – Get total size of all mailboxes

By on • ( 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

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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.

6 replies »

  3. 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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  5. Pingback: Microsoft 365 | Exchange Online: Ordnernamen in Outlook ändern (Bulk) – SID-500.COM

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