While surfing I just found a website called
  Microsoft Dynamics NAV Test Drive

Purpose is to introduce people/prospects who are unfamiliar with Microsoft Dynamics NAV and who do not have the Microsoft Dynamics NAV software at hand, to Microsoft Dynamics NAV.

By logging on to the Microsoft Dynamics NAV Test Drive using a web browser, people will be able to experience Microsoft Dynamics NAV 5.0 first hand without the need of installing it on the computer. It allows to explore the product or to follow guided exercises and demos.

Special chapters on Improved Job Handling, Advanced Job features, Efficient Inventory Processes, Manage Prepayments and Rapid implementation.

For each chapter, you can:

- View benefits: presentation and feature demo

- View video: video on the features

- Test Drive:
   Discover Microsoft Dynamics NAV by making guided exercises in the
   testdrive console.

The Microsoft Dynamics NAV testdrive console: a virtual environment which allows to discover, play around and make guided exercises without installing the Microsoft Dynamics NAV software.