With our current document management system, we currently have to display PDF's outside of the browser for the integration to work. If we display a PDF inside the browser, then we have no integration (i.e the WorkSite Toolbar) with our Document Management System. (Interwoven WorkSite).
I've spoken to Interwoven, and have been told that this is down to a limitation with Adobe Reader. I would love to have any further information on why this is this case, or why this doesn't work to support some input to a project I am working on.
I have a big issue with this too and are searching for a solution. I can't get the pdf-files to integrate into Internet explorer 7, and that is crucial for an application that I run. Have you gotten any answer from Adobe?