The mailhost file is installed with your ninemsn software. If this file is missing or damaged, ninemsn shows a "Mailhost file" message. To enable ninemsn to find the file:
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Click Start, and then click Run.
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Click Start, and then click in the Start Search box.
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Type regsvr32 c:\progra~1\msn\msncorefiles\mailui.dll in the text box, and then press ENTER.