The Inbox is the New Activity Stream
The latest version of Confluence (an enterprise Wiki developed by Atlassian) includes a feature called "WorkBox," which functions as a task management activity stream, similar to the way many people use and organize inboxes. Similar products are available by Asana Inbox and Yammer Inbox, and ail aimed at reducing email volume. External task management applications are an approach in contrast to task management within the inbox. Harmon.ie and Qontext, for example, aim to make the inbox more functional at task management, instead of trying to replace the inbox with a separate application entirely.