Microsoft has released a new service called “Editor” which provides the equivalent of the grammar and spell check in previous versions of Word. Editor provides these tools now as a cloud based service that uses more advanced analytics and human experts to identify issues.
The key advantage over the traditional spell check or grammar check features in Word is the Editor service will improve over time as it reads through and digests millions of supplied text samples and the rules and suggestions are augmented based on feedback from experts and users.