Office is one of the more popular (if not required) programs for many activities, so having it on a system is often quite convenient to have however, Microsoft has had an ongoing licensing restriction with its latest Office versions that prevents you from activating a previously used serial number on newer systems, even if you have uninstalled the software from prior systems.
Microsoft has changed its license agreement for its Office 2013 productivity suite, which now allows you to transfer serial numbers to new systems and activate it to allow the software to work.
