Last, but equally important, a new method allows extending the services without making the previous versions of the client software obsolete.

最后，但也是同样重要的一点是，新方法允许在不停用以前版本的客户端软件的情况下扩展服务。

This method has become obsolete, it is now the most passive and least effective method.

这种方法已经过时了，现在已是最被动，最没效的方法。

This method has become obsolete, and it is now the most passive, not the most efficient method.

这种方法已经过时了，现在已是最被动，最没效的方法。