I haven't found an actual thread for this, hopefully I'm not missing it... (Edit: I did find a couple references to it now for other phones, I originally found it somewhere on XDA though, sorry about that.)
I know people using the 20xxx ROM series are experiencing issues with not being able to select multiple files by dragging with your finger/stylus, and I may have a fix for that. It does not affect Outlook, but it should work for File Explorer. You have two options for this, a regedit or a cab that does the regedit for you. I posted the regedit in the thread for eRice's TP ROM but I figured I'd post it here for a little more exposure. Please let me if this works for you as well.
Code:
HKCU\ControlPanel\Gestures\Touch
Add DWORD "Disabled" with a value of 1
This does not require a soft reset, but you will need to completely close and reopen File Explorer if it's open when you apply the regedit.
The cab is attached in a zip, it does the same thing.