Yes, Microsoft Messenger for Mac gives you access to the Windows Live
Messenger Service.
On 8/20/07 2:05 PM, in article
1187636720.753558.95060@57g2000hsv.googlegroups.com, "adks17@hotmail.com"
> I don't know if this is a redundant question, I apologize beforehand,
> but I have a mac and am interested in the i'm Windows Live Messenger
> feature. I just downloaded the Messenger for Mac, and wondered if the
> i'm program worked through this. Thanks.

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Mickey Stevens (Microsoft MVP for Office:mac)
Office & Mac Resources: <http://home.earthlink.net/~mickey.stevens/>