With the retirement of Acrobat.com workspaces, the Acrobat.com option for shared reviews and forms distribution will no longer be available in Acrobat 9, X, and XI. You will still be able to conduct shared reviews and collect PDF form responses but you will need to use your own internal server (such as a SharePoint workspace, a network folder, or, for Shared Reviews, a web server). You will still be able to collect comments and form responses via email.
You might also consider subscribing to the Adobe FormsCentral online service to collect and analyze PDF form data using Acrobat 9, X, or XI. This tutorial on How to distribute PDF and web forms explains how to do this.