The MapPoint Web Service was discontinued about two years ago. If you want an online solution, look at the various Bing Maps products/services which include AJAX and web services, and replaced MWS.
The MapPoint desktop product remains in production. Documentation for 2013 is online and ships with the application. It has an ActiveX control but this is not suitable for Internet applications because each user would require a licensed copy of MapPoint installed on their machine. In an Intranet it is possible to do this, but generally it is not practical for the Internet.