Instant Messaging (and later, voice/video calling) has been with us, in the corporate world, for 15 years – the first real enterprise IM platform was Exchange 2000 Instant Messaging, which used a variant of MSN Messenger as its client, and some workers had been using MSN and AOL for a while before that.
The Exchange 2000 IM server was a one-off; it was superseded by Microsoft Office Live Communication Server (released at a time when everything at Microsoft was seemingly prefixed or suffixed “Live”, and somehow linked to Windows or Office) and latterly Office Communications Server (when the edict came around to ditch the practice of sticking “Live” in every product name), and later acquired the much groovier name of “Lync”.
And now the next phase has rolled out; just as the original MSN Messenger gave way to Windows Live Messenger (see?) and then went away in favour of Skype, Lync has now given over to Skype for Business – though SFB is effectively a technology update, rebranding & a new UI, rather than the wholesale change of underlying technology that MSN/Live Messenger to Skype was.
So now we have Skype for Desktop (the traditional Windows, Mac etc application, which uses a Skype ID or Microsoft Account to sign in), there’s Skype for a variety of mobile & TV platforms, Skype for Outlook.com (the plugin to Outlook.com online email, you know, the email service that was once Hotmail). And for Windows 8.x users, there’s also Skype the Modern Application, now also being referred to as Skype for Tablet.
And now the spangly new Skype For Business client has been distributed via Windows Update, as an update to Lync – so you may already have received it. If you haven’t, and you’re still on Lync, you could either:
Try downloading the update to turn Lync into Skype, from KB2889923- If you’re running Office in “Click to Run Mode”, you can check for updates by going into (for example) Word and choosing File / Account, then select Update Options / Update Now. See here for more.
Or maybe you’ll get it automatically via a corporate deployment. It may even have been pushed out to you already,
Whatever, you’ll have a cracking new updated UI compared to Lync, and the emoticons will be better again… in fact, most of the animated icons from the regular consumer Skype app have made it over to the corporate one, with a few of the less work-oriented ones removed. 
