"There were also product notifications and at the top of the communities pages"

But not every Intuit user visits this place.  As far as notifications go, so much useless junk gets put in those notifications that a lot of users just get in the habit of ignoring them. 

Intuit is really good about e-mailing trying to sell customers new products and wanting customers to complete surveys, so one extra e-mail a year letting folks know about shutdown dates might be nice.  And it would be even nicer if you put in the e-mail subject line that the e-mail regards shutdown dates.