Microsoft Office 2016 Professional; Outlook 2016 - Microsoft Community

windows10....

when pc boots popup message:

"either there no default mail client or current mail client cannot fulfill messaging request.  please run microsoft outlook , set default mail client"

reading message, saying open outlook , somewhere in outlook need set default mail client....i know of within outlook there setting make default mail client.

what have done is, have gone settings/apps....default apps...mail shown outlook 2016...so changed mail....then outlook 2016...that did correct issue.

i went control panel/default programs....scrolled down outlook 2016, clicked set default...it showed program has defaults....also outlook 2016 clicked on set assoc program, items in list checked.

outlook 2016 run should, annoying popup keeps popping up....  have overlooked setting?  how stop popup displaying.  

open outlook > file > options > general > down below have check box make default program.

Office / Outlook / Windows 10 / Office 2016