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I just downloaded the Zimbra 4.0 Open Source Edition and looked through the docs that came with it for upgrade instructions. The only thing I found was a note in the Zimbra_Release_Note.pdf that said that upgrade instructions could be found by going to http://www.zimbra.com/community/ and clicking on Documentation. I did that and I'm not seeing anything. Is that something that is going to be up soon?
I have a mondoarchive backup of the whole system going right now and I'll do a separate backup of just the zimbra stuff just before I do the upgrade. It would be really bad to have to start from scratch on this.