Research Internships at Microsoft provide a dynamic environment for research careers with a network of world-class research labs led by globally-recognized scientists and engineers, who pursue innovation in a range of scientific and technical disciplines to help solve complex challenges in diverse fields, including computing, healthcare, economics, and the environment. Current research directions include agent evaluation and environments, reinforcement learning and post-training, user modeling and simulation, agent and group memory, personalization and continual learning, analysis of large-scale interaction logs, and human-AI collaboration.