I've spent way too much time making a few passes at the various issues with PDF files in Office365.
These are some of the solutions that are now included in the solution described on this page.
Open PDFs in Browser
Fix Missing PDF Icon
Add 'Open PDF in Browser' Menu Item
This is a simpler and more complete solution that works on any O365 Edition (P1-E3)
Special thanks to Matt at WeBBrewers.com
for helping me test this.
Special thanks to Randall at www.firsttechdirect.com
for fixing issues with extra dots in filenames and folders in doc view.
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Here's what the results look like on P1 Teamsite:
Get files on your environment:
1) Create a new Document Library called Utilities.
2) Download the the latest version of the Utilities Files.
Now you should have a Utilities Document Library on your top-level site here:
Navigate there to confirm it exists. It should look like this on P1 (minus the o365 branding on E3):
Now you're ready to add the enhancements to your Document Library Views. It's a good idea to hide this library from your Left Navigation so curious users don't mess with it.
Enhance your Document Library Views:
(Repeat the following steps on each Document Library View that you wish to enhance. Alternatively, you could add the script reference to the site master page using SPD)
1) Open your Document Library View (i.e. AllItems.aspx) and Click 'Edit Page' in 'Site Actions' Menu.
If you dont see 'Edit Page' you can paste the following at the end of the URL:
2) Add Content Editor Web Part
3) Setup the CEWP like so:
1- Move it to below the Doc List View
2- Select Edit Web Part Properties
4- Select Hidden Checkbox
4) Apply, Save and refresh the page and you'll see the enhancements pictured at the beginning of this article.
Repeat these steps for every Document Library View to show the enhancements on that page.