This document summarizes PUMPTM Office Talk, a mobile messaging app for enterprises. It allows for 1-to-1 and group chatting between colleagues based on a company's legacy system. Key features include creating and managing chat groups, searching for coworkers, push notifications for new messages, and setting profiles and preferences. The app architecture ensures encrypted data transmission between the mobile clients and central server, which manages user registration, devices, favorites, groups, and sends notifications. Sample user interfaces and usage scenarios for team communication and management are provided.