Interesting to see WSJ analysis on alternatives for more effective email, but the article includes at least one error -- Notes 8 will suggest users put attachments into Quickr workspaces, not activities.
Notes also can be set up to include "activities," a way to organize emails, documents and appointments around a project. Notes shows a list of all activities in a separate pane, and users can drag an email straight from the inbox into the relevant project; everyone on the team will get an email notification of the change. If the user tries to send an email with a large attachment to several people, Notes will suggest putting the document into an activity instead, to reduce the strain on email resources.
Source: Rethinking the Inbox - WSJ.com