if ( (Get-PSSnapin -Name Microsoft.Exchange.Management.PowerShell.E2010 -ErrorAction:SilentlyContinue) -eq $null)
{
    Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2010
}
$customer = "PuTYouRDataBaseNameHere"
$maxDBsize = "15"

$NagiosStatus = "0"
$NagiosDescription = ""

$db = Get-MailboxDatabase -Status $customer | select name
$dbs = Get-MailboxDatabase -Status $customer | select Databasesize
$DBsize = $dbs.DatabaseSize.ToGB()




    if ($dbsize -gt $maxDBsize)
    {
        if ($NagiosDescription -ne "") 
		{
			# Format the output for Nagios
			$NagiosDescription = $NagiosDescription + ", "
		}
        
	       $NagiosDescription = $NagiosDescription + $db.Name + " = " + $dbsize		
            # Set the status to failed.
		      $NagiosStatus = "2"

  
    
    } #end if
   if ($NagiosStatus -eq "2") 
{
	Write-Host ""$NagiosDescription" GB in use. Max. allowed is: "$maxdbsize" GB"


} 
else 
{	
Write-Host "OK: Database $customername is not to large"

}



exit $NagiosStatus