Conversations feature has been revamped in CA PPM 15.2. With the new Conversations feature, team collaboration has become a breeze. You can stay in touch with your team members, discuss about tasks, tag members or the entire team. Conversations also aid in allocating and requesting for resources or roles for investments. You get notified when someone mentions you in a conversation and you can directly respond to the conversation from the notifications.
To learn more about and take a look at how to use this cool feature, see the Conversations article here.