if you want to control the notification you receive when you are in the Office 365 portal here’s how you do it.
Firstly, login to your Office 365 portal in a browser.
In the top right corner select the COG and then select and the Office 365 settings from the menu that appears.
Then select Notification from the menu that appears on the left.
Simply switch the notification you don;t want off on the right hand side.
Now you can make all those annoying notifications go away so you can be more productive!