Should I support Unicode in passwords?

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I would like to allow my users to use Unicode for their passwords.

However I see a lot of sites don't support that (e.g. Gmail, Hotmail).

So I'm wondering if there's some technical or usability issue that I'm overlooking.

I'm thinking if anything it must be a usability issue since by default .NET accepts Unicode and if Hotmail--er, the new Live mail--is built on that, I don't see why they would restrict it.

Has anyone encountered similar issues?

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