Hello, 

I have a script that allows me to make a InPlaceHold newly created mailboxes via Exchange 2010.

But every time I run, he released me an error message: See attached picture.

Here is the script in question:

#Initialize variables
$policyname = "In Place - Hold"
$members = Import-CSV "C:\migration\Script\New_User\New_User_List.csv"  -delimiter ";" 
$Result = "C:\migration\Script\New_User\New_User_Result.log"

$powerUser = "******"
$powerPass = "******"
$password = ConvertTo-SecureString $powerPass -AsPlainText -Force
$adminCredential = New-Object -TypeName System.Management.Automation.PSCredential -argumentlist $powerUser,$password

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $adminCredential -Authentication Basic -AllowRedirection
Import-PSSession $Session

#Get current mailboxes in our mailbox search
$InPlaceHoldMailboxes = (Get-MailboxSearch $policyname).sourceMailboxes

#Add another user to the array, the line bellow can be a loop of more than one user.
foreach ( $member in $members)
{
    if ($InPlaceHoldMailboxes -contains($member.name))
    {
    Write-Host $("User " + $member.name + " already present") -ForegroundColor:yellow
    Out-File -FilePath $Result -InputObject $("IN-PLACE HOLD - WARNING, User " + $member.name + " already present in members")  -Encoding UTF8 -append
    }

    else
    {
        $InPlaceHoldMailboxes += $member.upn
        Write-Host $("User " + $member.name + " added") -ForegroundColor:green
        Out-File -FilePath $Result -InputObject $("IN-PLACE HOLD - SUCCESS, User " + $member.name + " added to members")  -Encoding UTF8 -append
    }

}

#Add them to the MailboxSearch
Try
{
    Set-MailboxSearch $policyname -SourceMailboxes $InPlaceHoldMailboxes -Force -ErrorAction 'Stop'
    Write-Host $("SUCCESS, " + $policyname + " updated") -ForegroundColor:green
    Out-File -FilePath $Result -InputObject $("IN-PLACE HOLD - SUCCESS, " + $policyname + " updated")  -Encoding UTF8 -append
}
Catch
{
    Write-Host $("ERROR, policie " + $policyname + " NOT updated") -ForegroundColor:red
    Out-File -FilePath $Result -InputObject $("IN-PLACE HOLD - ERROR, " + $policyname + " NOT updated")  -Encoding UTF8 -append
    Write-Error $_.Exception.ToString() > $Result
    Exit
}

#start the mailboxsearch
Start-MailboxSearch -Identity $policyname -Force

Remove-PSSession $Session

I use Powershell 4.0

Thank you for your help.

Please read the error message carefully as it tells you what is wrong. "You cannot update multiple mailboxes".  You must do one at a time.

Thank you for your reply.

I do it one at time.