Adobe created PDF, but gave it away to an ISO twenty or so years ago, so not all PDFs are Adobe PDFs. Microsoft also makes PDFs. If you use a Microsoft Office product and create a Microsoft PDF, then Adobe has absolutely nothing to do with the process. You can also open a PDF in any PDF viewer. If you open it in Adobe Reader, then you can go to File > Properties to see if it is a Microsoft PDF, Adobe PDF, macOS PDF, etc.
This is an Adobe forum, so I create Adobe PDFs using the Acrobat tab of the Ribbon in Microsoft Office. Adobe PDFs using PDFMaker retain more interactive information.
I did find this on the Microsoft website for creating Microsoft PDFs from Outlook. This may be what they need if they don't have Acrobat Pro, but I haven't tested it.