If you'd like to upgrade your mxODBC 2.0 licenses to version 3.0, please contact our sales team.
Since eGenix mx Base is our open-source software distribution, there is no need to upgrade a license. However, eGenix mx Base does come with a slightly changed license, the eGenix.com Public License 1.1.0.
Regarding changes to the various packages, please see the package documentation. We have taken great care to make the upgrade as smooth as possible. There are only very few things that have changes in incompatible ways.