Why isn't string.Normalize consistent depending on the context?

I have the following code:

string input = "ç";
string normalized = input.Normalize(NormalizationForm.FormD);
char[] chars = normalized.ToCharArray();

I build this code with Visual studio 2010, .net4, on a 64 bits windows 7.

I run it in a unit tests project (platform: Any CPU) in two contexts and check the content of chars:

• Visual Studio unit tests : chars contains { 231 }.
• ReSharper : chars contains { 231 }.
• NCrunch : chars contains { 99, 807 }.

In the msdn documentation, I could not find any information presenting different behaviors.

So, why do I get different behaviors? For me the NCrunch behavior is the expected one, but I would expect the same for others.

Edit: I switched back to .Net 3.5 and still have the same issue.