Note: We have 250 other definitions for OCS in our acronym Attic This definition appears very frequently and can be found in the following categories of Acronym Finder: (1) (Office Communications Server) The predecessor of Microsoft Lync Server. See Microsoft Lync. (3) (occupant classification system) A vehicle safety system that uses dual-level airbags and pressure sensors to determine the height and weight of the person sitting in the passenger seat. If there is an accident that triggers the airbags, they would unfold completely for an adult, but only partially or not at all for a child. Based on how a person sat in the seat, previous systems were not always able to distinguish adults from children, but they have improved a lot. (2) (Open Computer and Software Inventory) software that automatically collects hardware and software data from the network for asset management and inventory purposes. OCS software agents collect data by residing on Windows, Linux, Mac, Solaris, and AIX computers themselves. For more information, see