As Maciej Los liked my suggestion I'll post it as a solution - it might stop you getting flamed too
Have a look here , I've also seen some mutterings about itextsharp
http://stackoverflow.com/questions/1785582/best-way-to-convert-pdf-to-powerpoint-serverside-in-net[
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As an aside, I suspect this is some sort of corporate report collation exercise as it has to happen every month (we have do something similar) - it might be worth trying to convince them that they really want the reports in PDF format and just merge the individual reports into a single PDF