Looking at BranchCache for Windows 7 and Windows Server 2008

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BrancheCache gives users of Windows 7 and Windows Server 2008 R2 increased network responsiveness, by reducing wide area network (WAN) utilization when accessing files from a branch office that are located in a central office.

Enabling BranchCache causes a copy of the file that is accessed from a file or Web server and located in a remote office to be cached in the local branch office. The next time a client requests the file, BranchCache first attempts to retrieve it from the local BranchCache.

BranchCache makes sure clients are authorized by the content server and the files are up-to-date, so  clients never have to worry about retrieving files that are not current.

• BranchCache clients must be running Windows 7 and the BranchCache feature has to be enabled. 
• Web servers must be running Windows Server 2008 R2 with the BranchCache feature enabled.