The Dynamics NAV / Navision upgrade tools are a collection of objects, documents and other tools to assist and guide the Navision professionals (developers and consultants) in the upgrade process.
Usually any new Navision version is distributed along with one or more upgrading tools, supporting the previous version or sometimes several previous but still supported earlier versions at the time of the release of the new version.
Each upgrading tool might consist of several items, including documents describing both the new version peculiarities in comparison to the previous ones, and the upgrade processes.
The Data Conversion Tools are the most important part of an upgrade toolkit. They are a set of FOB Files containing the objects that will be used to restructure the data contained in the old database according to the new design.
You find the upgrade tools for the older versions here.