Not sure if this will help, but very oddly I can only get Exchange Notifications pushed to me if the notification is turned OFF. I have the sound ON, but he visual (envelope) turned OFF, with emails set for "as they arrive".
Simply put, the notification ON/OFF switch appears to be backwards, like a faucet with it's hot and cold knobs on the the wrong damn sides.
Also, I found that installing Exchange first (before Yahoo or Gmail) and as the primary account didn't seem to help--but that is part of my set up if it happens to matter.
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