Besoin d'ajouter une commande "Wait" à un script Powershell

Voici mon code actuel :

Write-output “ENTER THE FOLLOWING DETAILS - When Creating Multiple New Accounts Go to           EMC hit F5(refresh) and make sure previous new account is listed before proceeding to the       next one”
$DName = Read-Host “User Diplay Name(New User)"
$RUser = Read-Host "Replicate User(Database Grab)"
$RData = ((Get-Mailbox -Identity $RUser).Database).DistinguishedName
$REmailInput = Read-Host “Requester's Name(Notification Email goes to this Person)"
$REmail = ((Get-Mailbox -Identity "$REmailInput").PrimarySmtpAddress).ToString()

Enable-Mailbox -Identity "$DName" -Database "$RData" 
Set-CASMailbox -Identity "$DName" -ActiveSyncEnabled $false -ImapEnabled $false -    PopEnabled $false

Send-MailMessage -From "John Doe <John.Doe@xyz.com>" -To $REmail -Subject       "$DName's email account" -Body "$DName's email account has been setup.`n`n`nJohn Doe`nXYZ`nSystems Administrator`nOffice: 123.456.7890`nJohn.Doe@xyz.com" -SmtpServer exchange@xyz.com

Ce code fonctionne parfaitement environ la moitié du temps, mais l'autre moitié, j'obtiens cette erreur en retour :

ENTER THE FOLLOWING DETAILS - When Creating Multiple New Accounts Go to EMC hit
F5(refresh) and make sure previous new account is listed before proceeding to
the next one
User Diplay Name(New User): Jane Doe
Replicate User(Database Grab): Julie Doe
Requester's Name(Notification Email goes to this Person): Joanna Doe

Name                      Alias                ServerName       ProhibitSendQuo
                                                            ta
----                      -----                ----------       ---------------
Jane Doe                  JDDAFA               exchange@xyz.com      unlimited
Set-CASMailbox : Jane Doe is not a mailbox user.
At C:\emailclientbasic.ps1:11 char:15
+ Set-CASMailbox <<<<  -Identity "$DName" -ActiveSyncEnabled $false -ImapEnable
d $false -PopEnabled $false
+ CategoryInfo          : NotSpecified: (0:Int32) [Set-CASMailbox], Manage
mentObjectNotFoundException
+ FullyQualifiedErrorId : 292DF1AC,Microsoft.Exchange.Management.Recipient
Tasks.SetCASMailbox

Donc, si quelqu'un pouvait m'aider à lancer une sorte de commande d'attente après la création de la boîte aux lettres et attendre que la boîte aux lettres de l'utilisateur soit créée avant que le script ne désactive ActiveSync, etc. ce serait vraiment utile. Je crois que le simple fait d'utiliser le commutateur -wait ne fonctionne pas.