Did you try installing Messenger 4.0.1?
<http://www.microsoft.com/mac/downloads.aspx#MSN>
On 10/30/04 2:32 AM, in article
0f43b06c0a873d4623afe612e6e87ec9@localhost.talkaboutmac.com, "outis"
> I have been using MSN Messenger 4 for Mac up to now without problem (with
> OS X). Today I cannot manage to sign in. the only thing that has changed
> is that I installed a Trial version of Norton Anti-Virus which scanned my
> disk all night long. I am working from a personal computer, not a network.
> By the way, I have always had this problem on my laptop (8.6), never
> managed to sign in.

Signature
Mickey Stevens (Microsoft MVP for Office:mac)
PowerPoint FAQ featuring PowerPoint:mac: <http://www.pptfaq.com/>
Entourage Help Page: <http://www.entourage.mvps.org/>