I have a similar problem and this issue seems to go back to Acrobat 9 and Office 2007, judging from Google searches. For me, when I click the Convert to PDF in the Context Sensitive menu, I get a "Create Adobe PDF" dialog box that states Unable to find "Adobe PDF" Printer or "Acrobat Distiller" Printer. Do you want to run the installer in repair mode? Running a repair of Acrobat or Office does not fix the problem. I'm not sure if a solution to my problem will fix Rachel's issue or if a fix to her problem will fix mine. This may not be a feature many people use, but those use it rely on it heavily to save them time. Of the three computers I've checked today they all have the same problem. Since this has been going on for nearly 10 years apparently, I would think there would be a solution readily available. Since you'll ask, we're running Windows 10 Enterprise 1703, MS Office 2016 through Office 365, and Acrobat DC, specifically version 17.009.20058.37826 according to the About window.
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