Astoria Offline is designed for to build an End-to-End occasionally Connected system. This will be available Next version of ADO.NET Data Services.
This release is built on top of the ADO.NET Data Services v1.0 release and .NET Framework 3.5 SP1.
Supported Operating Systems: Windows Server 2003; Windows Server 2008; Windows Vista; Windows XP Service Pack 2; Windows XP Service Pack 3
Visual Studio 2008 SP1
.NET Framework 3.5 SP1
Microsoft Sync Framework v1.0
You can download CTP1 from here ASTORIA OFFLINE.