Support. com, Inc. is a US-based multinational computer technology corporation that provides online tech support. It is headquartered in Redwood City, California, USA. Support. com provides online computer support to consumers and home-based business across the United States and Canada via remote access. Their services are performed on PCs running Windows XP, Windows Vista, and Windows 7 and Apple machines running Mac OS 10.5 or higher, with a high-speed broadband connection.