What are common issues when trying to access an Exchange mailbox using PHP?

One common issue when trying to access an Exchange mailbox using PHP is authentication errors due to incorrect credentials or lack of proper permissions. To solve this, ensure that the username, password, and Exchange server settings are correctly configured. Additionally, make sure that the account being used has the necessary permissions to access the mailbox.

<?php

// Exchange server settings
$server = "exchange_server_address";
$username = "username";
$password = "password";

// Accessing the Exchange mailbox
$ews = new ExchangeWebServices($server, $username, $password);

// Code to access mailbox goes here

?>