Exchange Server Mailboxes size report 2010 2013 2016
Create a C:\Temp1 directory.
Obtain Mailbox Database name from the Microsoft Exchange Console that would look like “Mailbox Database XXXXXXXXXXX”
Using Exchange PowerShell (Run as Admin), type the following:
Get-MailboxStatistics -Database “Mailbox Database XXXXXXXXXXX” | Select DisplayName, ItemCount, TotalItemSize | Sort-Object TotalItemSize -Descending | Export-CSV C:\temp\mailBox-Size.csv
That will generate a csv report saved in C:\Temp1.
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