It shows up as an add-in in Outlook 2013 but if you check the box a message appears saying "not loaded - a runtime error occurred during the loading of the COM addin"
It also shows as a loaded add-in in Word 2013 and Excell 2013, but doesn't show on the ribbon.
Nuance PDF Converter add-in shows on the Ribbon for Word 2013, Excel 2013, and Outlook 2013, so its not as if Office 2013 is incompatible with pdf converter software.
I'm guessing this is something that won't be fixed in X Pro now that XI is out, so the only choice seems to be either upgrade to XI or change to PDF Converter.