Phone says 84 Draft emails, computer says 0

I use Hotmail (Outlook) almost exclusively for email. My Samsung Galaxy S5 shows 84 draft emails (almost all with "no recipients") and accidentally put there. I "think" drafts were auto-saved because I hit the back-arrow (lower right, next to the home button). I can't delete any via a long-tap . . . & there surely is a better way to empty a folder than 1-by-1 anyway.

So I tried on my win10 computer. The draft email folder shows empty on my computer. How do I empty that folder & how do I keep from accidentally saving more unwanted drafts?

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