Jan 9, 2013

Check mailbox size and usage with Office 365 or Exchange online. Find users nearing their quota.

The other day I wanted to have a look at the mailbox usage for one of my Office 365 clients.  I wanted to see all 35 users and find out if anyone was close to their mailbox quotas.  There is no way to check this for all users at once using the Office 365 or Exchange Online GUI so you need to turn to PowerShell.  I had to go to 5 or 6 different sites to find all of the little details and troubleshoot some errors so I thought I'd compile all of that info into a blog post for you.

  1. First of all, you need to use the regular version of PowerShell.  NOT the "Online Services Module" for PowerShell version that you would typically use for other Office 365 tasks, I guess because we are talking directly to the Exchange environment here and not the Office 365 portal itself. 
  2. Make sure you run PowerShell as an administrator. (Right-click the icon and select "Run as Administrator")
  3. The first time I ever tried to run these type of scripts, I got an error about running remote signed scripts or something like that. So you need to run this command the very first time you try any operations like this:  
    • Set-ExecutionPolicy RemoteSigned
  4. Next are the 3 commands that you need to run to connect to your hosted Exchange server and start a new session:
    • $LiveCred = Get-Credential (then enter your Office 365 email address and password in the box that pops up)
    • $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $LiveCred -Authentication Basic –AllowRedirection
    • Import-PSSession $Session
  5. Next is the basic command to get a list of all users and their current mailbox size:
    • get-mailbox | get-mailboxstatistics | ft displayname, totalitemsize
  6. When you are finished, it's a best practice to go ahead and close your session before you exit PowerShell, so you need to run this command:
    • Remove-PSSession $Session
These steps should get you connected and give you a quick look at user mailbox sizes so you can see if anyone is in danger of hitting their quota.  There are a ton of other scripts that can give you all sorts of information about the hosted Exchange environment.  I even some scripts that would actually create a local Excel spreadsheet and pipe the output to that file so you could save it or analyze it further. I'll try to post more of this type of stuff in the future.


Anonymous said...

Great post.
I was always intimidated from PS.
Not anymore.
t y v m.

Love SMS said...

Hi, from last 6 yrs i am working on free OS's (Linux/Unix) which are free and also provides free S/W as well, hence I am interested only in free S/W as well as OS. In these 6 yrs i even not worked on any windows/Microsoft flavours even at home

Anonymous said...

Thanks So Much for this made my life so easier thanks

Dom said...

Thanks for this - now I need to go and find all the other PS commands for things like increasing mailbox size!

Anonymous said...


Anonymous said...

you are saved my time :) Thanks

Anonymous said...

Excellent guide, thank you. Started looking through your other posts.

Anonymous said...

Very Helpful Article ... Thanks a lot

Anonymous said...

Thanks for the article.

What command so i use if i want to generate a report of all users with a 5gb mailbox or over?


Anonymous said...

I just found & tried this, but it gave me my local Exchange stats - not the Exchange Online that I was looking for (and authenticated with in an early PowerShell step).

Is it because I was using an admin workstation that has my Outlook accounts, plus Exchange Management Console & Exchange Management Shell also installed (but not open)?

Binh said...

Thank you very much for taking the time to research this up then posting the command. This was very helpful because I needed to track the size of a mailbox for a client of mine!


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Very helpful, exactly what I needed.

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