Almost 3 years ago, I was working with a customer who wanted to add instant messaging to Lotus Connections, IBM's Enterprise 2.0 collaboration platform. As you may suspect, Lotus Connections is integrated out of the box with the IBM instant messaging client, Lotus Sametime. The challenge with the customer is that they were using the Microsoft solution, something called Office Communicator Server (OCS).
Then, I was able to successfully show presence information in Lotus Connections based on Microsoft OCS. And I even documented how to do it in this developerWorks article. One thing that I was never able to do was add the presence information in the business card (the little widget that pops up next to a name).
I'm happy to inform that Epilio has actually done this and has even created a YouTube video (sans audio) to demonstrate the functionality:
Very cool, huh? Update: You can find the source code and the documentation here.