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From Microsoft:
Microsoft Sync Framework 2.1 ProviderServices (64-bit) provides the Microsoft Sync Framework 2.1 redistributables that developers can include with applications that use synchronization. The Sync Framework components are provided in three separate redistributable packages so that installation can be tailored to application requirements. Microsoft Sync Framework 2.1 ProviderServices (64-bit) includes managed and native API for simple custom providers, the file synchronization provider, the metadata storage service, and also DLLs for the lightweight database that the storage service uses.
