I saw a similar post tacked on to the end of the " Zimbra now Yahoos! thoughts" thread, but I figured it might tend to get lost in the shuffle there.
I went to the Zimbra forums this morning and saw the announcement about 5.0RC1 being released. So I followed the links to download it and three things caught me by surprise. First, the Open Source edition is no longer hosted on Sourceforge. Second, there is now something called the "Yahoo Public License" related to using the source code. Lastly, I noticed that 4.5.8 has also been released, yet there was nothing in Announcement page about this and there are no release notes to be found. I also checked pm.zimbra.com and there is nothing there about 4.5.8.
I'm not saying there is anything bad about any of these three things, but in the past things like this usually aren't done unannounced. Anyone care to comment, specifically anyone from Zimbra?