Get it from
http://www.caetano.eng.br/os2page/
The mercury web site is
http://www.mercury.to/
" Mercury is a Java Based MSN client.
With Mercury you can do the same things as with your normal messenger:
* Talk to friends
* Change your nickname and status
* Add a display picture (also know as avatar)
* Send files through the msn server (for people with a firewall etc..) or direct
* Play games (Tic Tac Toe and Connect4 only at the moment)"
Source: Daniel Caetano