Exchange Server 2007 leverage on .NET Framework

Do we know how Exchange Server 2007 leverage on .NET Framework v2.0 (or for that matter .NET Framework v3.0)?

Answer: https://msdn.microsoft.com/library/default.asp?url=/library/en-us/ExDefaultSDK/html/a3a2080b-926c-48b6-998d-bf0e411e61be.asp

This website lets you download the SDK for Exchange Server 2007 to develop Exchange 2007 applications.

It also provides sample codes and sample solutions to demonstrate further on how to go about developing these applications.