Wow your customers with a library of free Microsoft training.
You can put this professionally assembled course ware on every desktop you look after.
The image below is the first section of the multi part Calendar basics for Outlook 2010 .
There's about a 100 courses.
If you are thinking, "Can I add custom training for each customer?", then you like us.
You and your customers can create their own custom videos, and you can create learning sections that only appear at each customer.