You can also wait for the users to contact you when they get a quota warning, or when they no longer can send email. That's a bit late.
With PowerShell you can easily find out the mailbox size, but the quota limit is either Unlimited, which means that the mailbox database defaults are used, or it can be set at a certain limit.
Find the mailbox quota
get-mailbox mailbox | select-object DisplayName, ProhibitSendQuota, ProhibitSendReceiveQuota
DisplayName ProhibitSendQuota ProhibitSendReceiveQuota
----------- ----------------- ------------------------
User Name Unlimited Unlimited
Find the mailbox size and database quota
Get-MailboxStatistics -identity mailbox | select-object Displayname,TotalItemSize,TotalDeletedItemSize,DatabaseIssueWarningQuota,DatabaseProhibitSendQuota
DisplayName : User Name
TotalItemSize : 1.125 GB (1,208,281,527 bytes)
TotalDeletedItemSize : 24.14 MB (25,309,210 bytes)
DatabaseIssueWarningQuota : 5 GB (5,368,709,120 bytes)
DatabaseProhibitSendQuota : 6 GB (6,442,450,944 bytes)
So, the numbers are all there, just not in a nice format...
To make a long story short - here's a PowerShell script that will output all mailboxes with a quota usage over 80%
<#
.SYNOPSIS
TGet-MailboxSizeQuota.ps1 returns all mailboxes above a certain quota (ProhibitSendQuota) usage.
.DESCRIPTION
TGet-MailboxSizeQuota.ps1 returns all mailboxes with a quota usage of 80% and above.
If you want to check for another quota limit, pass the percentage as a parameter.
TGet-MailboxSizeQuota.ps1
.EXAMPLE
TGet-MailboxSizeQuota.ps1
The above command will return all mailboxes with a quota usage of 80% and above
.EXAMPLE
TGet-MailboxSizeQuota.ps1 85
The above command will return all mailboxes with a quota usage of 85% and above
.NOTES
Author: Peter Haake
Date: 2015-01-20
#>
#
# Load the Exchange Management Module
Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn
# Make sure en-us locale is used no matter what the server/user has configured
# Keep this section if you output decimal numbers
# Slightly modified from From http://occasionalutility.blogspot.com.au/2014/03/everyday-powershell-part-17-using-new.html
[System.Reflection.Assembly]::LoadWithPartialName("System.Threading")>$null
[System.Reflection.Assembly]::LoadWithPartialName("System.Globalization")>$null
[System.Threading.Thread]::CurrentThread.CurrentCulture = [System.Globalization.CultureInfo]::CreateSpecificCulture("en-us")
# Set quotalimit to the first parameter passed. If no parameter is passed, set it at 80%
if ([INT]$args[0] -gt "") {
$quotalimit = [INT]$args[0]
}
else {
$quotalimit = 80
}
# Get all mailboxes
$Mailboxes = @(Get-Mailbox -ResultSize Unlimited | select-object DisplayName, Identity, ProhibitSendQuota, ProhibitSendReceiveQuota)
# Clear the report object variable
$Report =@()
# Loop through all mailboxes
foreach ($usr_mailbox in $Mailboxes)
{
# Get statistics for all mailboxes
$usr_mailboxstats = Get-MailboxStatistics -identity $usr_mailbox.Identity | select-object Displayname,Identity,Database,TotalItemSize,TotalDeletedItemSize,DatabaseIssueWarningQuota,DatabaseProhibitSendQuota
#Convert TotalItemSize to INT64 and remove crap (looks like this initially "1.123 GB (1,205,513,370 bytes)" and comes out as a numeric 1205513370)
[int64]$usr_mailboxstats_totalitemsize = [convert]::ToInt64(((($usr_mailboxstats.TotalItemSize.ToString().split("(")[-1]).split(")")[0]).split(" ")[0]-replace '[,]',''))
#Convert TotalDeletedItemSize to INT and remove crap (looks like this initially "1.123 GB (1,205,513,370 bytes)" and comes out as a numeric 1205513370)
[int64]$usr_mailboxstats_totaldeleteditemsize = [convert]::ToInt64(((($usr_mailboxstats.TotalDeletedItemSize.ToString().split("(")[-1]).split(")")[0]).split(" ")[0]-replace '[,]',''))
# If the mailbox quota is Unlimited, then the database defaults are used.
if ($usr_mailbox.ProhibitSendQuota -eq "Unlimited") {
# Get quota from Database
[INT64]$usr_quota = [convert]::ToInt64(((($usr_mailboxstats.DatabaseProhibitSendQuota.ToString().split("(")[-1]).split(")")[0]).split(" ")[0]-replace '[,]',''))
}
else {
# Get quota from user mailbox
[INT64]$usr_quota = [convert]::ToInt64(((($usr_mailbox.ProhibitSendQuota.ToString().split("(")[-1]).split(")")[0]).split(" ")[0]-replace '[,]',''))
}
# Calculate the quota percentage
$usr_quota_percentage = [INT]((($usr_mailboxstats_totalitemsize + $usr_mailboxstats_totaldeleteditemsize) / $usr_quota)*100)
# Add to report object
if ($usr_quota_percentage -ge $quotalimit) {
$usr_reportObject = New-Object PSObject
$usr_reportObject | Add-Member -MemberType NoteProperty -Name "DisplayName" -Value $usr_mailboxstats.DisplayName
$usr_reportObject | Add-Member -MemberType NoteProperty -Name "TotalItemSize" -Value $usr_mailboxstats_totalitemsize
$usr_reportObject | Add-Member -MemberType NoteProperty -Name "TotalDeletedItemSize" -Value $usr_mailboxstats_totaldeleteditemsize
$usr_reportObject | Add-Member -MemberType NoteProperty -Name "ProhibitSendQuota" -Value $usr_quota
$usr_reportObject | Add-Member -MemberType NoteProperty -Name "QuotaPercent" -Value $usr_quota_percentage
$report += $usr_reportObject
}
}
# Output the report, sorted with the highest quota percentage at the top
$Report | Sort-Object QuotaPercent -Descending
Output looks something like this
DisplayName TotalItemSize TotalDeletedItemSize ProhibitSendQuota QuotaPercent
----------- ------------- -------------------- ----------------- ------------
User Name 8316860830 49373170 9663676416 87
Second User 14581624515 17277483 17179869184 85
Third Person 5472939739 15151742 6442450944 85
Send the output from the script as an email
If you want to schedule the script to run every week or so, it might be convenient to have the output sent to you in an email. Create another script, and call TGet-MailboxSizeQuota.ps1 from that as below:
Send-MailMessage -to email@domain.com -Subject "Quota Report" -SmtpServer mail.server.FQDN -From from@domain.com -Body (C:\Scripts\TGet-MailboxSizeQuota.ps1 | ft | Out-String)
This can easily be added as a scheduled task. Just make sure to run the task under a user account that has enough rights in Exchange.
