So, where does this leave the existing Windows clients/servers? Vistas clients will be compatible with all down-level machines. The protocol revision to be used for remote file operations is decided during the negotiation phase. A Vista client advertises to the server that it can understand the new SMB 2.0 protocol. If the server (Longhorn Server or otherwise) understands SMB 2.0, then SMB 2.0 is chosen for subsequent communication, otherwise they fall back to SMB 1.0. This preserves downward compatibility so that deploying Vista clients or Longhorn servers should be straightforward. The following chart describes what protocol will be used when communicating between different types of client and servers -
--Navjot and Prashanth
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