How to integrate Pidgin and Evolution into the message indicator?
Solution 1:
This is likely related to the bug: https://bugs.launchpad.net/ubuntu/+source/indicator-messages/+bug/1040259
In 12.10, the libindicate API was deprecated and a new API was introduced (libmessaging-menu). If you look at the bug page, many applications are in the process of being ported to this new API, including Evolution and Pidgin.
Looks like the Pidgin bug is in progress at least, so we'll have to wait this out.