Powershell Primäresmtpadresse an anderes Postfach übertragen

# -------------Variables---------------------
$global_mailbox_name = "myglobalmailbox"  
$group_name = "Ausgeschiedene Benutzer"  
$company_name = "FIRMA XYZ"  
# -------------------------------------------
# Load ActiveDirectory module
Import-Module ActiveDirectory

# determine Exchange server FQDN from AD
$exchange_server = Get-ADObject -LDAPFilter 'objectClass=msExchExchangeServer' -SearchBase (([ADSI]"LDAP://RootDse").configurationNamingContext.ToString()) -Properties networkaddress | select -Expand networkaddress | ?{$_ -match 'ncacn_ip_tcp'} | %{$_.split(":")[1]} | select -First 1  
if (!$exchange_server){Write-Host "Could not determine Exchange Server from AD" -ForegroundColor Red; return}  

# connect to exchange
$session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri "http://$exchange_server/powershell" -Authentication Kerberos  
Import-PSSession $session -DisableNameChecking -AllowClobber | out-null

# Get global mailbox
$global_mailbox = Get-Mailbox $global_mailbox_name

# iterate over all members of the group
Get-ADGroupMember $group_name | Get-ADUser -Properties Company | %{
    $mbox = Get-Mailbox $_.SamAccountName -ErrorAction SilentlyContinue
    if ($mbox){
        # users primary mail address
        $user_prim_address = $mbox.PrimarySmtpAddress.ToString()
        # check if users mail address is already in global mailbox and if he is member of a specific company
        if ($user_prim_address -notin $global_mailbox.EmailAddresses -and $_.Company -eq $company_name){
            "Disabling mailbox of user '$($_.SamAccountName)' ..."  
            $mbox | Disable-Mailbox -Confirm:$false
            "Adding primary email address '$user_prim_address' to global mailbox."  
            $global_mailbox | Set-Mailbox -EmailAddresses @{Add=$user_prim_address}
        }
    }
}

# close exchange session
Remove-PSSession $session

# -------------Variablen---------------------
# Gruppe in der die ausgeschiedenen Mitarbeiter gesammelt werden
$group_name = "Ausgeschiedene Benutzer"  
# Zuordnung der Firmen zu globalen Postfächern
$company_mapping = @{
    "DemoFirma" = "myglobalmailbox1"  
    "DemoFirma2" = "myglobalmailbox2"  
    "DemoFirma3" = "myglobalmailbox2"  
}
# Pfad für die CSV-Datei die den Status (Datum) der Mailadressen aufzeichnet 
# um sie nach X Monaten entfernen zu können
$mail_expiration_file = 'C:\mail_expiration.csv'  
# Entferne E-Mail Adressen nach Ablauf von X Monaten aus den globalen Postfächern
$mail_expiration_months = 6
# -------------------------------------------
# Load ActiveDirectory module
Import-Module ActiveDirectory

# Load Exchange environment
Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn

# iterate over all members of the group
Get-ADGroupMember $group_name | Get-ADUser -Properties Company | %{
    $mbox = Get-Mailbox $_.SamAccountName -ErrorAction SilentlyContinue
    if ($mbox){
        # Get global mailbox
        $global_mailbox = Get-Mailbox $company_mapping[$_.Company] -EA SilentlyContinue
        if ($global_mailbox){
            # save users mail addresses into an array
            $user_mail_addresses = $mbox.EmailAddresses.SmtpAddress
        
            "Disabling mailbox of user '$($_.SamAccountName)' ..."  
            $mbox | Disable-Mailbox -Confirm:$false
            "Adding email addresses '$($user_mail_addresses -join ',')' to global mailbox '$($global_mailbox.Alias)'"  
            $global_mailbox | Set-Mailbox -EmailAddresses @{Add=$user_mail_addresses}
            # Exporting mail addresses to csv file
            $user_mail_addresses | %{[pscustomobject] @{Date=(get-date -F 'd');'EMail'=$_;'GlobalMailbox'=$global_mailbox.Alias}} | export-csv $mail_expiration_file -Delimiter ';' -NoType -Encoding UTF8 -Append  
        }else{
            Write-Error "The specified global mailbox for '$($_.Company)' does not exist."  
        }
    }
}

# check for expired mails in csv
if ((Test-Path $mail_expiration_file)){
    $csv = Import-CSV $mail_expiration_file -Delimiter ";"  
    $expired_mails = $csv | ?{(get-date $_.Date) -lt (get-date).Date.AddMonths(-$mail_expiration_months)}
    # if there are expired mail addresses
    if ($expired_mails){
        # remove expired addresses from their corresponding global mailbox
        $expired_mails | group GlobalMailbox | %{
            "Removing expired addresses '$($_.Group.EMail -join ',')' from global mailbox '$($_.Name)'"  
            Set-Mailbox $_.Name -EmailAddresses @{Remove=$_.Group.EMail}
        }
        # remove expired mails from csv
        $csv | ?{$_.EMail -notin $expired_mails.EMail} | export-csv $mail_expiration_file -Delimiter ';' -NoType -Encoding UTF8  
    }
}

$user_mail_addresses = $mbox.EmailAddresses.SmtpAddress 

$user_mail_addresses = $mbox.EmailAddresses -replace '^SMTP:',''