Is Escargot aiming to support old IM clients exclusively?

Escargot isn’t aiming to support just retro messaging services. It’s aiming to support any messaging services and protocols it can find, old and new. Aside from MSN Messenger and Yahoo! Messenger support, Escargot also has an IRC frontend in the works, and much more are to come soon. Some protocols and networks being considered for Escargot frontends are XMPP, Telegram, and Discord, and more will be looked into soon. As long as a protocol supports basic messaging and presence and can be integrated with our other frontends, we’ll implement it.