ADO.NET Data Services (Astoria) Release

Microsoft releases ADO.NET Data Services, codenamed 'Astoria,' as part of the .NET Framework 3.5 SP1. This initial offering provided the core concepts of exposing relational data as RESTful resources with query capabilities.

Significance

This marked the first public availability of the technology that would evolve into OData, establishing the foundational ideas of URI-addressable data and server-driven query filtering for .NET developers.