First of all, thanks.
I want to know if there's some example or documentation about how to make a plugin to modify (specifically add a kind of input text, like text or emoticons) the Lync 2010. I read the Lync SDK and other documentation related, but i can only found ways of make my own application with Lync properties, not how to modify or add funcionalities to the client itself.
Thanks in advance
There really isn't a way to modify the Lync client itself, it doesn't have a plugin model. Basically, you've got 2 options:
From what you said about your application, it sounds like option 2 is the way to go. Roughly speaking, you'd do this:
Most of this is described in the article I linked to. You could also check out the Tabbed Conversations application for an example of an app that's doing the same thing.