winmail.dat problems with Exchange 2007

I have a problem where when someone emails internally from one person to another a PDF file from Quickbooks, the attachment comes through as a "winmail.dat" file.

I've looked into the problem and there are multiple suggestions online but I am looking for a permanent fix that I can apply to the exchange server instead of having each user make the required changes.

Does anyone know how to fix this on SBS 2008 using Exchange 2007?
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You could tell Exchange not to use RTF:

Open Exchange Management Console

Expand Organization Configuration

Hub Transport

Edit the default properties

Under Exchange Rich-text format, select Never use.

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