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When you create a Microsoft .NET Framework 1.1 application to use the QueryEx operation in the Search Web service, the Web service call fails in Microsoft Office SharePoint Server 2007 and in Microsoft Office SharePoint Portal Server 2003.
This problem occurs because .NET Framework 1.1 applications cannot deserialize array types.
To resolve this problem, build the application by using the .NET Framework 2.0 or a later version.