Windows Vista of January 2009, it had been announced that Vista usage had surpassed Microsoft's pre-launch two-year-out expectations of achieving 200 million users. At the release of Windows 7 (October 2009), Windows Vista (with approximately 400 million Internet users) was the second most widely used operating system on the Internet with an approximately 19% market share, the most widely used being Windows XP with an approximately 63% market share. In May 2010, Windows Vista's market share had an estimated range from 15% to 26%. On October 22, 2010, Microsoft ceased sales of retail copies of Windows Vista, and the OEM sales for
Windows Vista networking technologies Vista for backward compatibility. A new version of the Server Message Block (SMB) protocol was introduced with Windows Vista. It has a number of changes to improve performance and add additional capabilities. Windows Vista and later operating systems use SMB 2.0 when communicating with other machines running Windows Vista or later. SMB 1.0 continues in use for connections to any previous version of Windows, or to Samba. Samba 3.6 also includes support for SMB 2.0. Remote Differential Compression (RDC) is a client-server synchronization protocol allows data to be synchronized with a remote source using compression techniques to minimize the amount