You are correct that webmail uses /owa/ for web access. However, /ews/Exchange.asmx is actually a SOAP API address. If you go to this address on your Exchange server, you should be prompted for a username and password. Enter that, and you will get a Services.wsdl that describes all the supported SOAP requests. We have Exchange 2010, but still use POP to receive the helpdesk messages. I've had far fewer troubles using POP, even with other help desk products.
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