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Lack of Unicode Support for ASP on IIS 4.0
If you are currently using Unicode on IIS 4.0, you many be wondering why I said that it is not supported. If your Web server is configured correctly, you should get an Invalid Code Page error as described in Knowledge Base article Q254313. However, you may be using Unicode on IIS 4.0 and not getting the error. There are two reasons for this. First, Unicode was turned off in Windows NT® Service Pack 4 because ASP was originally written to handle ANSI data and Unicode characters larger then two bytes in size were truncated. Second, if you have Service Pack 4 or greater but still use Unicode, it is because the Windows NT Service Pack was not reapplied after the Windows NT Option Pack was installed. We have heard that some customers didn't install the Windows NT Service Pack if they wanted to guarantee that the characters in their applications were less than two bytes in size. (This isn't a good idea in general, because you lose the benefits of the service pack updates, and you can get mixed results due to mismatched components in the operating system.)
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