Assuming you can manually print duplex from Word (ie the printer supports it), I think the problem is that you need to specify duplex in the PrintOut method of the Word server but it's only supported in the Mac version. There's an article in the KB:
A quick way of testing if this is the solution, is to download a trial copy of PDXPro (ActiveX DLL) from my web site. It uses only API functions to get printer capabilities and get/set printer settings. It includes a test bench app with full source code to try everything out. If PDXPro sets duplex successfully then the kb article should work for you.
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