Instantbird makes use of Mozilla's rendering engine to generate chat windows and Pidgin to connect the different networks.
The chat networks you can access with Instantbird include: MSN Messenger, Yahoo Messenger, MySpace IM, SameTime, Simple, Netsoul, AIM, Gadu Gadu, QQ, Google Talk, XMPP, Bonjour, SILC, IRC, GroupWise, and ICQ. It's possible to connect to more than one network at the same time.
Instantbird is still in its preliminary phases, which is why its features are basic, although some are very interesting, like grouping conversations into tabs.
Minimum requirements for Instantbird are the following: Windows 2000, XP, or Vista; 128 MB of RAM; and 100 MB of free space on the hard drive.