Microsoft is looking to include it's own Portable Document Format (PDF) reader in Windows 8 dubbed, Modern Reader. Modern Reader will display PDFs as one would expect, including functions for zooming in and out, page scrubber on the side of the application, side-by-side page views.
Adobe has pretty much stopped Microsoft in their tracks when it comes to supplying PDF to Windows as a standard, but now things are changing. Right now it could be that Modern Reader is simply a PDF reader, but I'm sure more information will become available soon enough.
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