DirectX 10 introduced several significant improvements to support anti-aliasing in deferred shading, addressing some of the limitations found in previous versions. Here are the key enhancements:

1. Multi-Sampling Anti-Aliasing (MSAA): DirectX 10 included better support for MSAA in deferred shading environments. It allowed developers to apply MSAA to the final scene rendering, effectively smoothing out edges without the heavy performance hit that previous techniques might impose.

2. Shader Model 4.0: The introduction of Shader Model 4.0 provided more advanced shading capabilities, enabling developers to create more complex shaders that could handle anti-aliasing more efficiently. This model also allowed for more flexible rendering techniques, which could contribute to improved visual quality.

3. Enhanced Buffer Management: DirectX 10 improved the management of render targets and depth buffers, allowing for more efficient sampling and filtering operations. This meant that anti-aliasing could be implemented more effectively in a deferred shading pipeline.

4. Post-Processing Effects: With DirectX 10, developers could leverage post-processing techniques like FXAA (Fast Approximate Anti-Aliasing) and SMAA (Subpixel Morphological Anti-Aliasing) more easily, which worked well with deferred rendering techniques to provide smoother visuals.

These improvements collectively made it easier for developers to implement effective anti-aliasing techniques in games and applications using deferred shading, enhancing the overall visual quality without significantly impacting performance.

For more details, you might want to check resources or documentation related to DirectX 10 and its features.