We've got some bad news for those who rely on PDF Reader for checking through documents on the go. The app will soon no longer be supported on Windows 10 Mobile. A notification detailing the end of support for PDF Reader has been put on display for app users. Come July 1, all things PDF Reader for mobile will cease to be worked on.
Should you wish to continue viewing PDFs on your Windows 10 Mobile handset post-July 1, you'll need to download a third-party app or – as Microsoft would prefer – fire up Microsoft Edge and view documents in the web browser.
Thanks to Ahmed F. for the tip!