Long-Term Servicing Channel. These are less frequent releases, expected every 2-3 years (with the next one expected in 2019), designed for special-purpose PCs such as those used in point-of-sale systems or controlling factory or medical equipment. Each of these releases will be serviced for 10 years from the date of release. (The Long-Term Servicing Channel replaces the Long-Term Servicing Branch [LTSB].)