Wrong answer, at least for a time. Microsoft was actually sued by Adobe over the PDF implementation with Office 2007 (before it was standardised in ISO, that wa

Wrong answer, at least for a time. Microsoft was actually sued by Adobe over the PDF implementation with Office 2007 (before it was standardised in ISO, that was circa 2008-9 if I remember correctly). That's also the reason that XPS (the weird Microsoft format, not Dell laptops) exists. Nowadays though, I don't really know since Microsoft has successfully overturned that case (probably because of Adobe being Adobe?).