I am always of the mindset, if it ain’t broke, don’t fix it. But with technology there is a trade off, and that sacrifice is compatibility.
So you waited and waited to upgrade your blog, only to find out that your database is completely different then the newer version that you want to use.
For WordPress the solution is rather simple:
First grab a plugin that allows the older version to output to a format the newer version can import, in this case a xml file.
The plugin to do this is located here
Follow the directions for install , then export from your old blog, import to your new one.
Took me a few hours to figure this out, hopefully this post will help you compress that time a bit.