I had the same issue. Realizing it's an Adobe Add-In issue, I was able to remove this annoying thing. How I did it: I opened Outlook > File > Options > Add-Ins > Manage [COM Add-ins], Click GO. Then I unchecked both Add-ins: 1) Acrobat PDF Maker Office COM Addin and 2) Adobe Document Cloud for Microsoft Outlook - Acrobat. Clicked OK. Annoying menu bar is gone. 🙂
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