I have Windows Phone 10, Outlook, and all latest updates. I installed Microsoft's PDF reader app (I also tried the Adobe app).
I open an email and tap on a PDF attachment. Instead of opening, it tells me that I need an app and should search the store. I click "Yes", it takes me to the store, and a blank page is shown.
How do I open PDFs in Outlook?
PS: I also tried saving the file to the phone, and opening it in the File Explorer app. But it doesn't get saved, and the file is not there!