Check out Harnessing the Power of PowerPivot in the Enterprise for some advice on how to tackle the next big challenge after migrating MS Access DBs to more controlled enterprise offerings.
Most companies have, at some point, spent a fortune transitioning, changing platforms of, or supporting mission-critical applications written in MS Access by users who are, shall we say, less than savvy technically. PowerPivot could easily create a far greater drain on an unsuspecting IT organization. Not only can users create desktop applications (similar to Access), but they will also have the ability to publish their creations to the masses using shared infrastructure, a frightening prospect for many CIOs.
Ok, now I’m really worried!