The only software I miss is "Preview" on Mac OS. It's amazing for editing pdfs - merge, split etc.
For that we have to go back about a decade:
http://betanews.com/2006/06/02/adobe-to-sue-microsoft-for-pd...
http://windowsitpro.com/windows-server/microsoft-strips-key-...
The long and short of it is that Adobe threatened to sue Microsoft for including PDF support as a feature in Office (despite allowing it on OS X and OpenOffice at the same time) so MS stopped doing anything PDF related. Adobe was widely derided in the software industry over the incident.
So we all can thank Adobe for that.