If you have used SharePoint 2010 to store documents in a document library you will know that users are prompted to download and save them rather than just opening in the default PDF reader application.
There are ways within On-Premise SharePoint to get around these issues albeit while introducing some security risks. These steps can be found at the following blog entry
The question becomes how we do this when we are hosted in the 365 cloud. We cannot run PowerShell commands on the cloud servers so here is a solution by Joshua Booker
Office 365 Solution
** May require some modification to the WebForm with regards to Relative path
While this still does not allow you to open files directly it does allow you to open files within your browser without the two step save and open. See our other Blog entry how to Use Google Chrome as Your Default PDF Viewer for some additional tricks.
