All you need to do is to logon to your Exchange server with your mailbox database on, open up the Exchange Management Shell (EMS) and then run the following command:
Get-MailboxStatistics -Database "First Storage GroupMailbox Database" | Select DisplayName, ItemCount, TotalItemSize | Sort-Object TotalItemSize -Descending | Export-CSV C:MBSizes.csv
Press enter and this will export the data into a CSV file on the root of your Exchange Server.
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