Components are self-contained and autonomous with “stateful” information (which is required for implementing persistence).

On the otherhand, Services are mostly ‘stateless’ (and inherently use components to achieve their intended functionality). Persistence is not something that is directly related to Services.

Also, the main difference between Component-oriented and Service-Oriented approach is the ‘ownership’. You, the user, own the Component – on the contrary, you do not own the Service, you just ‘use’ the Service (and pay per service).

Gopalakrishna Palem
Creator of CFugue C++ Runtime
http://gpalem.web.officelive.com/CFugue.html