To display mailbox size in Exchange 2007 run this command in Exchange Management Shell.
get-mailboxstatistics | fl displayname, totalitemsize
To pipe the output into a text file.
get-mailboxstatistics | fl displayname, totalitemsize > c:\mailboxsize.txt
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I run the below code (PS1 file) as a task every 24h:
Add-PSSnapin Microsoft.Exchange.Management.PowerShell.Admin
$date = get-date -uformat %Y-%m-%d_%H-%M-%S
Get-User -ResultSize Unlimited | Where {$_.RecipientType -eq "UserMailbox"} | Select DisplayName, Company, City | foreach {
$MailboxInfo = Get-Mailbox -identity $_.displayName
$MailboxStat = Get-MailboxStatistics -identity $_.displayName
Add-Member -InputObject $_ noteProperty UseDefault $MailboxInfo.UseDatabaseQuotaDefaults
Add-Member -InputObject $_ noteProperty TotalItems $MailboxStat.ItemCount
Add-Member -InputObject $_ noteProperty TotalSizeMB $MailboxStat.TotalItemSize.Value.ToMB()
Add-Member -InputObject $_ noteProperty DeleteItems $MailboxStat.DeletedItemCount
Add-Member -InputObject $_ noteProperty DeletedSizeMB $MailboxStat.TotalDeletedItemSize.Value.ToMB() -PassThru
} | Export-Csv -Path \\servername\MailboxSize_$date.csv
it will dump a csv file with the date in the file name in a specified folder you can then use that data as you please!
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