Query on lync server client coomunication

Hi,

We want to develop an application which can be installed on lyn server. This app will fetch data from third party app and generate notification on lync clients based on this. I want to have a customised lync conversation window for this on the cleint side. So for this:-

1. Is it correct to choose UCMA 3.0 as the server technology.

2. Is it possible to call the custom conversation window on the client side from the Server app.

I am very new to Lync development. Any pointers would be appreciated.