It might be a good idea to update our phabricator install. It's documented here : https://secure.phabricator.com/book/phabricator/article/installation_guide/#updating-phabricator
Since the tool is now critical for us (and the EU project), I think it's best to make a backup just before the upgrade, and test if the new version doesn't remove or change too much a feature we'd rely on. Sebastian & Herbert will most likely be able to tell if something is broken.
Newer versions provide for example a nice group discussion tool that might replace the dying forum, and the time consuming mailing list.