MSDN的官方解释:The Microsoft Developer Network (MSDN) is a set of online and offline services designed to help developers write applications using Microsoft products and technologies. We're committed to making MSDN the premiere location for developer resources on the Web and are implementing changes to improve the usability of the site。
MSDN包括在线资源和离线的订阅,这个范围就大多了,不仅仅包含一个.net SDK,还有其它的SDK、文档、软件等。MSDN的部分资源,比如下载中心和离线订阅都是收费的。