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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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Not All Methods Are Created Equal

For the most part, all Exchange Web Services methods respect the ExchangeImpersonation and SerializedSecurityContext SOAP headers. However, the Availability Web methods referred to in Chapter 21 and Chapter 22 do not honor the ExchangeImpersonation SOAP header, but instead rely solely on the SerializedSecurityContext SOAP header. If you make an Availability Web method call such as GetUserOofSettings and pass in an ExchangeImpersonation SOAP header, the header is ignored, and the call will be associated with the actual calling account rather than the Act As account in the ExchangeImpersonation header. The Availability Web methods use Token Serialization for internal purposes. It doesn’t make sense for you as a ...

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