If LTSB stands for 'Long-term Servicing Branch,' what's this 'LTSC' acronym I've seen? That means fewer changes during a set timeline, a less-involved upgrade effort, and fewer disruptions as well as fewer possibilities for applications breaking because of a modification of the OS. Where other Windows 10 servicing models push feature upgrades to customers every six months, LTSB does so only every two or three years. Officially, LTSB is a specialized edition of Windows 10 Enterprise that promises the longest intervals between feature upgrades of any version of the operating system. Just what is LTSB? And what has Microsoft done to make it an afterthought?