Windows 10 Enterprise 2015 LTSB (Upgrade) is a specialised edition of Windows 10 Enterprise that promises the longest intervals between feature upgrades of any version of the operating system. Where other Windows 10 servicing models push feature upgrades to customers every six months, LTSB does so only every two or three years. 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.
LTSB does not include Edge nor any Microsoft Store (Universal Windows Platform, or UWP) apps because the browser and those apps constantly change and need updating. Also not included is the Cortana voice-activated digital assistant.