@weirdami
If he doesn't continue, isn't there a Trillian clone on Amiga that would do MSN anyway?
The closest you would get to Trillian (msn, y!, irc, etc) would be
Jabberwocky, a jabber-client for Amiga OS.
http://jabberwocky.amigaworld.de/ I tried AmiMSN, among others for OS3.9, primarily for doing filetransfers.
I could not (either) get it to work fully, so I discovered Jabberwocky.
But since jabber runs over servers which often don't allow filetransfers,
I ended up using IRC instead (wookiechat).
I for one thinks it would be *NICE* with a fully fledged working messenger
for the Amiga, be it AmiMSN, Jabber or something else !
It should also be able to use other networks like yahoo of course.