HI Anna
Thanks for the feedback, but the first link is for Outlook 2010, and I had already found that fix and it does not run on a 64 bit W7 computer.
The second link also refers to 2010 and a potentially corrupt registry key, but again I am not sure this is the issue, I am willing to try and delete and repair the registry key (after backing up) But, did get a chance to look at the link I posted with the solution for W8, then you will see that the problem appears to be caused by the "click to run" installations, this was the suggested solution
""The registry edit is here for Office 2013 64 bit click to run installations that will enable Outlook 2013 to be recognized by third party applications:
1. Create registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\15.0\Outlook
2. Create String value:
Bitness
3. Set the String value for Bitness to:
x64""
I have tried to do this by creating the additional string value, but it does not seem to work in my W7 64 bit environment.
By the way this is not an Adobe problem, there are dozens of people out there searching for a solution to this on the various forums, it applies when opening a pdf from an email, from the web or a download, and in fact anytime you open Adobe. However not limited to Adobe, if I scan from my printer, the software has "no default email client" and it would appear to apply to ALL third party software.