Ok, I read it in the release notes...
Quote:
Update about Instant Messaging feature - In order to ensure the
scalability of our server software and provide a quality experience to our
customers, we have removed IM interoperability with AOL and MSN that
was present in previous 5.0.0 beta releases. This functionality may be
restored in a future release.
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But, are you shure that it's fully removed (code) or only disabled via configuration?
I think it should be possible to enable it so it can be tested to give a feedback to zimbra for improving it and then release it in a later version...