我遇到过这段代码，用PHP访问Exchange：
https://github.com/rileydutton/Exchange-Web-Services-for-PHP
它（以及其他）似乎使用NTLM over SOAP，如下所述：http://www.howtoforge.com/talking-soap-with-exchange
我不熟悉SOAP。使用此方法是否存在安全问题？数据是否安全传输？在Services.wsdl中提供足够的SSL肥皂地址吗？
<wsdl:service name="ExchangeServices">
<wsdl:port name="ExchangeServicePort" binding="tns:ExchangeServiceBinding">
<soap:address location="https://exchange.example.com/EWS/Exchange.asmx"/>
</wsdl:port>
</wsdl:service>