There is a new version (2.1) of WordPress that has some advantages over the previous versions.
One significant improvement is that it is much better optimized in accessing the database, so it runs faster and has less impact on the server.
Unfortunately, it requires a newer version of the database than we have installed. So if you try to upgrade, it will not work.
It’s likely we will be upgrading the server soon (a few months?), but until then I wanted to get this warning out.