Convert Word document to PDF on server

Hi all,

developing a windows application, I need to convert various file types (HTML, DOC, DOCX, etc.) to PDF.

I would like to do it on the server because clients have many different version of office installed, so I would avoid to use office interop dll.

I think the suggested way is to use Word Services of SharePoint. The point is that we would use only this feature of SharePoint, it's worth to use it ? (besides we have no experience of SharePoint... but we could learn to use it)

Is there an easier way to achieve my goal ?

Is recommended to use third parties software ?