If ITIL V2 had already proven beneficial, why was it rewritten to create ITIL V3?
ITIL is all about best practices, and certainly these best practices have to adapt to the changing business and technology landscape. ITIL was already updated almost 10 years ago from version 1 to version 2. You can easily imagine the amount of changes to the business and IT industry that have occurred since then — things such as the Internet, outsourcing and globalization were not yet a concern. ITIL V3 is mainly an updating of the best practices in order to keep up with the present environment, as well as set the stage for developments that are just beginning to be adopted, such as virtualization, insourcing and multisourcing. The need for business and IT alignment is now considered as insufficient, and in its place is an IT operation that is integrated into the business operations, creating an ecosystem between the two.