Script repository

$sourceUserDNAttribute = "assistant" # TODO: modify me

# Get source mailbox DN.
try
{
    $sourceUserDN = $Context.TargetObject.Get($sourceUserDNAttribute)
}
catch
{
    $Context.LogMessage("Source user not specified", "Warning")
    return
}

$sourceUser = $Context.BindToObjectByDN($sourceUserDN)
if ($sourceUser.RecipientType -ne "ADM_EXCHANGERECIPIENTTYPE_MAILBOXENABLED")
{
    $Context.LogMessage("The specified user does not have a mailbox", "Warning")

    # Clear the attribute.
    $Context.TargetObject.Put($sourceUserDNAttribute, $NULL)
    $Context.TargetObject.SetInfo()
    return
}

if ($sourceUser.RecipientLocation -ne $Context.TargetObject.RecipientLocation)
{
    $Context.LogMessage("Target mailbox and source mailbox are hosted in different Exchange Organizations", "Warning")

    # Clear the attribute.
    $Context.TargetObject.Put($sourceUserDNAttribute, $NULL)
    $Context.TargetObject.SetInfo()
    return
}

# Get source mailbox Exchange properties.
$sourceMailboxParams = $sourceUser.GetMailParameters()

# Create an empty instance of the 'AdmExchangeMailboxParameters' class.
$mailboxParams = New-Object "Softerra.Adaxes.Adsi.Exchange.AdmExchangeMailboxParameters"

# Copy 'Send As' permissions.
$mailboxParams.SendAs = $sourceMailboxParams.SendAs

# Copy 'Send on Behalf Of' permissions.
$mailboxParams.GrantSendOnBehalfTo = $sourceMailboxParams.GrantSendOnBehalfTo

# Copy 'Mailbox Rights'
$mailboxParams.MailboxRights = $sourceMailboxParams.MailboxRights

# Save the changes
$Context.TargetObject.SetMailParameters($mailboxParams, "ADM_SET_EXCHANGE_PARAMS_FLAGS_NONE")

# Clear attribute
$Context.TargetObject.Put($sourceUserDNAttribute, $NULL)
$Context.TargetObject.SetInfo()