Interoperability between MSN and Y!M will no doubt make life interesting. Quoth Tim: “i wonder how they’ll namespace the screennames.” Ars Technica has a writeup[1] with what little is known.

  1. Mr. Ken “Caesar” Fisher. “Microsoft and Yahoo shake hands on IM” Ars Technica 2005-10-11. http://arstechnica.com/news.ars/post/20051011-5419.html