FWIW, part of the problem MS has had with providing interoperability with Adobe products has been an apparently long-standing refusal by Adobe to give MS the required license. My understanding is that, even when they announced they'd make that licence available for free, Adobe refused to provide it to MS at all. All about protecting market share I guess - and trying to steer people away from MS products. Office 2007 was the first Office product with the ability to save to the PDF format and Office 2013 is the first MS product that has had the ability to read that format. Not that there was ever a technical difficulty; after all, Adobe was quite happy to allow anyone except MS to do this for years before.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]