I recently read an article about free software for businesses that are ad supported - some accounting software and some medical software for doctors and clinics.
So I thought - why not NAV?
In the USA, we could have the early morning ad - "trouble getting started? time for a Starbucks run."
Lunchtime - ads for restaurants advertising their specials.
Afternoon - time for a pick me up - things go better with Coca Cola.
End of work day - happy hour specials.
And for those conscientious after hours workers - treat yourself to Amazon's amazing specials.
Microsoft could get in the action too - be the first one on your block
city to own a Windows phone...