I would *highly* suggest setting up a test site and doing a practice upgrade on there first. I just did this with my 3.6 site and several of the modifications still work. I had several custom ones I needed to modify/upgrade, but many of the ones from here worked fine. Of course, I also got to just get rid of some because they have been replaced with default vb code. But doing this on a test site and upgrading the style there first so you can just export it and then import it to the new site makes upgrading soooo much easier.
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