Kyoto University, which was established as Japan's second imperial university in 1897, had developed and operated a mailing system for students on its own. Although demands for 24/7 operation of the system was increasing, it was difficult to avoid system down time for maintenance by on-campus operation. They selected Microsoft Live@edu considering the fact that its contract conforms to Japanese laws and the jurisdiction of Japan. The cloud-based new mailing system started operation from December, 2011 and has been used by about 23,000 students. Because functions of Microsoft Exchange Server, which is used in many companies, are also available on the system, it is expected that experience in using these functions may become of great help for students in business communication after graduation.