This is not an idea, it's a bug report. So when you try to use the "Share" button and "Send As attachment" via an open Adobe plugin PDF file in Internet Explorer, since the latest Office/Outlook update, Adobe is unable to open Outlook as the default mail client. It throws an error trying to open a new email. The next time I look at it I'll grab a screenshot of the error and attach it. It seems that the Adobe plugin for IE in particular does not work well with IE and the latest Outlook version right now.