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We are attempting to configure a exchange/helpdesk integrator that will allow our helpdesk appointments to be synchronized with our outlook appointments. The Exchange integrator is directly from the helpdesk vendor. It talks with exchange via EWS. The Integrator configuration is fairly simple. It asks for our exchange version which is 2007 SP2, mail server IP, EWS root folder and DNS - the dns we are told to enter as the characters appearing between @ and .com in our mail address. In any event, after we input these settings and hit the test button, it prompts us for our exchange credentials - domain\user, password and email address. I type all of these credentials in and hit test and then get the below error about 20 seconds later. Any help would be greatly appreciated. <br />
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Communication Failed<br />
Error: The request failed. The remote server returned an error:<br />
(403) Forbidden
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We are attempting to configure a exchange/helpdesk integrator that will allow our helpdesk appointments to be synchronized with our outlook appointments. The Exchange integrator is directly from the helpdesk vendor. It talks with exchange via EWS. The Integrator configuration is fairly simple. It asks for our exchange version which is 2007 SP2, mail server IP, EWS root folder and DNS - the dns we are told to enter as the characters appearing between @ and .com in our mail address. In any event, after we input these settings and hit the test button, it prompts us for our exchange credentials - domain\user, password and email address. I type all of these credentials in and hit test and then get the below error about 20 seconds later. Any help would be greatly appreciated. 

Communication Failed
Error: The request failed. The remote server returned an error:
(403) Forbidden

403 Forbidden error when attempting to access EWS

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.

Microsoft IIS Web Server

A web server refers to the software that helps to deliver web content that can be accessed either through the Internet or through an intranet. The primary function of a web server is to store, process and deliver web pages to clients. The communication between client and server takes place using the Hypertext Transfer Protocol (HTTP). The most common use of web servers is to host websites, but there are other uses such as gaming, data storage, running enterprise applications, handling email, FTP, etc.