PowerShell Get-MailboxStatistics

PowerShell Get-MailboxStatistics For Exchange Mailbox Size

With Get-MailboxStatistics you get a report on the size of the mailboxes, the number of messages they contain, and when each was last accessed.  Very often this is too much information, therefore you need to master the -Server or even the -Identity parameter.


Getting Started with Get-MailboxStatistics

Get-MailboxStatistics is an ideal command for taking your first tentative steps using PowerShell on an Exchange server.  Launch PowerShell, I favour the ISE GUI version, and type:


List the Get-MailboxStatistics Parameters

PowerShell is full of goodness.  In this instance you can get kill two birds with one stone, get more specific data as you learn about this cmdlet’s parameters.

Get-Help Get-MailboxStatistics

Use the parameters displayed by Get-Help to reduce the output to just database DB01:

Get-MailboxStatistics -Database DB02

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Here is another useful parameter:

Get-MailboxStatistics -Server ExchMbx1 

Get the stats for one particular user:

Get-MailboxStatistics -Identity "Mary Evans"

Get-MailboxStatistics TotalItemSize Property

Let us employ PowerShell to report on the mailbox size.  Incidentally, I discovered the TotalItemSize property by calling for Get-Member, this is what I tried:

Get-MailboxStatistics -Identity "Mary Evans" `
| Get-Member

This is how I put the new knowledge into practice: 

#PowerShell Gets Exchange 2010 Mailbox Size
Get-MailboxStatistics -Identity "Mary Evans" `
| Format-Table DisplayName, TotalItemSize

Convert TotalItemSize – To MB

A minor irritation with TotalItemSize is that the units are very small, namely bytes.  Fortunately, further research with Get-Member reveals a method (not a property) called ToMB().  It’s a bit of a struggle, but you can persuade PowerShell to display the Size in Megabytes with: @{label="Mailbox Size (MB)";expression={$_.TotalItemSize.Value.ToMB()}

Get-MailboxStatistics -Identity "Mary Evans" `
| Format-Table DisplayName, `
@{label="Mailbox Size (MB)";expression={$_.TotalItemSize.Value.ToMB()}

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This is the real deal – there is no catch.  SolarWinds provides this fully-functioning freebie, as part of their commitment to supporting the network management community.

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Compare PowerShell with the EMCGet-MailboxStatistics PowerShell cmdlet

From a learning point-of-view it it’s worth a walk-through in the Exchange Management Console (EMC), the benefit is you can compare the PowerShell script with what you see in the Exchange GUI.

  • Launch the EMC, navigate to the Recipient Configuration, Mailbox (see right).

Note 3: See more on PowerShell’s Get-MailboxStatistics.

Summary of Get-MailboxStatistics

Get-MailboxStatistics is a suitable command for learning about how PowerShell can interrogate Exchange.  Not only is it useful on its own, but
Get-Help Get-MailboxStatistics
will reveal useful parameters such as -Server,  -Identity and -Database.  Also how to display Exchange 2010 mailbox size in MB with TotalItemSize.

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See more PowerShell Cmdlets for Exchange 2010:

Exchange 2010 Home   • Get-ExchangeServer   • Set-ExchangeServer   • New-SystemMessage   • SP1

Get-Mailbox   • Get-MailboxStatistics   • Connect-Mailbox   • Enable-Mailbox   • Disable-Mailbox

PowerShell Exchange Cmdlets   • Set-Contact    • New-Mailcontact   • Add-MailboxPermission -identity