Merlin Information Systems is an international IT services company that uses Yammer to improve collaboration and efficiency across its global workforce. Yammer allows Merlin's employees in different locations and time zones to connect and work together seamlessly. It is used for daily communications, problem solving, and quickly setting up new service desks. Yammer reduced email volume by 50% and helped Merlin scale while retaining a small company culture and providing personalized customer service. Merlin is now exploring using Yammer to improve customer support.