Help needed to execute a remote powershell exchange command

Hi guys,

I'm a french girl, and a newbie into scripting domain, so if I just don't understand some of the things you explain me, please just be cool :)

So, I want to execute a remote powershell script from a windows 2003 server (monitoring server)  which will be able to count mailboxes on my unique exchange server.

I try this which is working well on the exchange server, but it returns an error message on my remote server :

"Le terme « Get-MailboxStatistics » n'est pas reconnu comme nom d'applet de commande, fonction, fichier de script ou pro
gramme exécutable. Vérifiez l'orthographe du nom, ou si un chemin d'accès existe, vérifiez que le chemin d'accès est co
rrect et réessayez.
    + CategoryInfo          : ObjectNotFound: (Get-MailboxStatistics:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Here is the script (get on ne the web) :
 

param([string] $Param )  

$Results = @()
$CountMB = 0

if(!$param)
 {
  $Servers = Get-Process -computerName name_of_server| Get-ExchangeServer | Where {$_.ServerRole -eq "Mailbox"} | Sort Name

  Foreach($Server in $Servers)
   {
    $dbs = Get-MailboxDatabase -server $Server | Sort Name
    
    foreach($db in $dbs)
     {
      $mb = Get-MailboxStatistics -Database $db | Where {$_.DisconnectDate -eq $null -and $_.ObjectClass -eq 'Mailbox'} | Measure-Object
      $mbdis = Get-MailboxStatistics -Database $db | Where {$_.DisconnectDate -ne $null -and $_.ObjectClass -eq 'Mailbox'} | Measure-Object
      
      Write-Host "$($Server) `t $($db.name)`t $($a.count)"
      
      $Obj = New-Object PSObject
      $Obj | Add-Member NoteProperty -Name "Server" -Value $Server
      $Obj | Add-Member NoteProperty -Name "Database" -Value $db.Name
      $Obj | Add-Member NoteProperty -Name "Mailboxes" -Value $mb.count
      $Obj | Add-Member NoteProperty -Name "Disconnected Mailboxes" -Value $mbdis.count
      $Results += $Obj
     }
   }
 }
else
 {
 $server = $param
  $dbs = Get-MailboxDatabase -server $Server | Sort Name

  foreach($db in $dbs)
   {
    $mb = Get-MailboxStatistics -Database $db | Where {$_.DisconnectDate -eq $null -and $_.ObjectClass -eq 'Mailbox'} | Measure-Object
    $mbdis = Get-MailboxStatistics -Database $db | Where {$_.DisconnectDate -ne $null -and $_.ObjectClass -eq 'Mailbox'} | Measure-Object

    $Obj = New-Object PSObject
    $Obj | Add-Member NoteProperty -Name "Server" -Value $Server
    $Obj | Add-Member NoteProperty -Name "Database" -Value $db.Name
    $Obj | Add-Member NoteProperty -Name "Mailboxes" -Value $mb.count
    $Obj | Add-Member NoteProperty -Name "Disconnected Mailboxes" -Value $mbdis.count
    $Results += $Obj
    $countmb += $mb.count
    
   }
  Write-Host
  Write-Host "$($Server) has a total of $($CountMB) mailboxes" -ForegroundColor Green
 }

$Results | FT -AutoSize

Any help will be appreciated !

Thanks all