Traction TeamPage Release 4.2, first shipped in November 2009, brought subscription features into the interface, introduced the ability to reply to comment on subscription notifications, added Table of Contents navigation from root articles for each space down to their child articles, and bundled the Metrics plug-in into the installed software. Subscription features allow for easy subscription (via Jabber or Email) to a space, a user, a document or a tag. Metrics reports provide overview and detail on user read, author, edit, comment, tag, and search activity.