PDF conversion to SharePoint library

Hi 

My requirement is about publishing office documents to pdf, i have document library 1 which consist of office document, i want to select a document and publish it as pdf to a destination Library2.

I have tried using codeplex free tool but it doesnt work. Any suggestion, how about developing an interface using word automation service?? 

Let me know if you have any source code or free tool available, will appreciate your response.

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