Basic question.

I’m doing an exterior scene and I want the sky to reflect in the windows. I am using Mr Sun/Sky and I tried three different materials for the glass...A&D Glass, ProMaterials Glazing, and Matte/Shadow.

All three result in a bright blue sky and grey relfections. I saved a corner of the image to demonstrate. What am I missing here?

Thanks.

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Your sky looks fairly uniform and featureless, no clouds, not much noticable gradiation, so there isn’t much to reflect that will show up easily. Adding clouds may help, or placing trees where they knock out part of the bright sky reflection.
For materials, A&D glass or pro mat glasing should be fine for this. Like real glass, they will reflect more when viewed from a more accute angle, and less from straight on. Don’t use matte/shadow for glass, it’s not for that.
Also, the render looks a bit washed out, have you enabled Gamma Corrction? Turning that on may give it a bit more contrast and saturation.

Use the A&D glass, and under the BRDF rollout change the radio button from Fresnel to Custom.  The adjust the lower level (0.2) to be higher (1.0 is perfect mirror).  That curve you see affects how much reflection you get based on what angle you view the object at.  The more oblique the angle, the more mirror-like the reflection.

3DS Max Design 2011 64-bit - Advantage Pack
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Thanks guys… those two tips seem to do the trick..I’m still tweaking the settings.

As a general tip, if you find yourself having to significantly change the parameters of the glass material from what is physically correct, the problem almost certainly lies somewhere else.

Also, to make glass look real, it sometimes helps to put a very slight bump map (noise or similar) on it to simulate the slight curves you get on a real sheet of glass, which show up in the reflections.