This post applies to Outlook 2010, 2013 & 2016
· In Outlook, select the "File" menu.
· Select "Options".
· Choose the "Mail" option in the left pane.
· Scroll down to the "Message arrival" section. Check the "Display a Desktop Alert" box if you want a notification box to appear when you receive an email. Uncheck it if you don't want a notification box to appear.
· Same way check uncheck "play a sound" if you wish to switch on or off the same.
