Determine Individual Mailbox Sizes in Exchange 2007

I am trying to migrate our small company to hosted Exchange Server from in-house.  I would like to know which mailboxes need some help slimming down before the migration.  Is there any way to list the sizes of the individual mailboxes?
thutchinsonAsked:
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comfortjeaniusCommented:
To open the Exchange Management Shell from the Programs .

1.Click Start, click Programs, and then click Microsoft Exchange Server 2007.

2.Click Exchange Management Shell.

 To add the Exchange Management Shell snap-in from Windows PowerShell  

1.Click Start, click Programs, and then click Windows PowerShell 1.0.


2.Click Windows PowerShell.

3. Type the following command:

Add-PSSnapin Microsoft.Exchange.Management.PowerShell.Admin

4.Use the chdir command to change to the Exchange Server\Bin directory

chdir "c:\program files\microsoft\exchange server\bin"

5.Type the following command: .\Exchange.ps1


Type or copy and past this command:

Get-MailboxStatistics | Sort-Object TotalItemSize -Descending | ft DisplayName,@{label="TotalItemSize(MB)";expression={$_.TotalItemSize.Value.ToMB()}},ItemCount


or check this link out

http://www.msexchange.org/articles-tutorials/exchange-server-2007/management-administration/getting-mailbox-statistics-exchange-2007.html
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dmwynneCommented:
I've done this in the past with Quest powergui and the Exchange management tools.

You can list all the mailboxes and see sizes.

http://powergui.org/entry.jspa?externalID=771&categoryID=47
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thutchinsonAuthor Commented:
Comfortgenious:  Can I type the "Get-MailboxStatistics" command into the Exchange Management Shell?  

What do I need the Power Management Shell for?  Not sure how this comes into play.

I'm the Controller, not a systems manager so you can't explain too much to me.  Thanks.
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comfortjeaniusCommented:
Yes did you check the  link below this is the first line of the article "A look at the Get-MailboxStatistics Exchange Management Shell cmdlet and how to manipulate its output in various ways."
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thutchinsonAuthor Commented:
Answer appeared technically perfect but I'm too busy right now to test something that I don't understand.  Pointing me to an article just buries me more.
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