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Inside Microsoft® Exchange Server 2007 Web Services by Huw Upshall, Mark Taylor, Ben Spain, Michael Mainer, David Sterling

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The Basic Principle

Let’s start with a basic walk-through of how S2S authentication works. You might consider the starting point to be the point at which the user accesses some portal server or Web application. From a work process perspective, you would be correct. However, for S2S authentication, whether the work process is initiated by the actual user or not is an external detail.

The starting point for S2S authentication is when a service account makes an Exchange Web Services request, such as GetItem, with additional information indicating which user the work should be performed on behalf of. Sure, this typically occurs as a result of direct user access, but such user involvement isn’t necessary.[254] In the IPS scenario, the service account ...

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