The MongoClient class was introduced in version 1.7 of the driver to support moving to the new Acknowledged WriteConcern and to standardize on the name of the root object across drivers. We'll be removing the MongoServer.Create methods and the ctors to MongoServer so that no users are still using the old WriteConcern default.

In addition, we'll be deprecating the MongoClient.GetServer method to discourage it's use as it is an entry point into the legacy API.