SMB 3.0 (Server Message Block 3.0) is a protocol that provides a way for a computer's client applications to read and write to files and to request services from server programs in a computer network.
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SMB 3.0 was originally introduced with Windows Server 2012 as SMB 2.2. It was renumbered to 3.0 to reflect the additions in the new release compared to the previous version, 2.1.
SMB 3.0 implementation is included with Windows Server 2012.