Any Instant Messaging app for Zimbra?

Hi,

We run Zimbra 8 Network edition for our company email. I have been playing around with this new IM, Skype-type messaging solution from Microsoft called Lync. It works pretty well, but got me wondering whether Zimbra has something similar or any plans in the offing.
It would make more sense as there's likely to be better integration that way.

Thanks
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