Types of S2S Authentication Requests
There are two types of S2S authentication requests. Exchange Impersonation is the publicly supported S2S authentication mechanism and is geared toward third-party applications that need to perform work on behalf of other accounts. Token Serialization is intended for use only in Exchange Server to Exchange Server communication and is not publicly supported by Microsoft. Given that, we could just gloss over Token Serialization and cover Exchange Impersonation in great depth. You are not going to use Token Serialization, right? However, this approach has several problems.
First, many developers have a voracious appetite for figuring out undocumented features, and the very fact that we have indicated that Token ...
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