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Does upgrading mysql from 4 to 5 delete the current mysql databases?

I’m using this guide
https://support.steadfast.net/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=45&nav=0,9

We just responded to your support ticket about this question. For others who are interested: no, if done correctly, your databases won’t be deleted.