At its core, SOA is a design pattern where components of a system provide services to other components via a communications protocol over a network. In the era of Windows 7, this meant moving away from monolithic applications (where everything is installed locally) toward applications that "call" web services for data and logic. Why Windows 7 was a Turning Point for SOA
: The Windows Communication Foundation (WCF) was a core component on Windows 7, providing a unified framework for building secure, reliable, and transacted services. windows 7 soa