Change your MacBook Pro OSX and Outlook for Mac email sounds

You can copy systems sounds to the Outlook Resources folders and rename .aiff to .wav and set the name, e.g. newmail.wav, reminder.wav, mailsent.wave (Purr.aff to newmai.wav / Submarine.aiff to Reminder.wav)

/System/Library/Sounds

/Applications/Microsoft Outlook.app/Contents/Frameworks/OutlookCore.framework/Resources

Because its just sounds cooler.