This paper provides the details of the implementation and challenges of the ILS migration project of Khalifa University University, Abu Dhabi. The University is established by merging the three prominent higher education institutions in Abu Dhabi, namely the Khalifa University of Science, Technology and Research (KUSTAR), the Petroleum Institute (PI), and the Masdar Institute of Science and Technology (MI). Before the merger, KUSTAR library used Innovative Interfaces' Millennium ILS, PI used Sirsi-Dynix's Symphony, and MI used the open-source Koha system (with the support of a service provider). After the merger, the new University decided to choose the KOHA ILS system for the campus libraries. This paper examines the objectives, risk factors, migration procedures, implementation tasks, customization, and challenges of ILS migration of Khalifa University