Exchange 2010: How to list folders in mailboxes (PS)
First store the output of the Get-Mailbox cmdlet in a variable. We do this to prevent piping errors when running multiple pipeline commands at the same time.
$mailboxes = Get-Mailbox
Run the following script to create a .csv file that contains ‘MailBox – # items in folder – folder size’.
$mailboxes | Select-Object alias | foreach-object {Get-MailboxFolderStatistics -Identity $_.alias | select-object Identity, ItemsInFolder, FolderSize} | Export-CSV C:\TEMP\MAILBOX_FOLDER_STATS.csv -NoTypeInformation