Sounds like you'll want to look into Live Communications Server:
http://office.microsoft.com/en-us/FX010908711033.aspx
--
--Jonathan Maltz [Microsoft MVP - Windows Server - IIS, Virtual PC]
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<(E-Mail Removed)> wrote in message
news:1eb501c4a2f4$d59fdc00$(E-Mail Removed)...
> Does anyone know if there is information in the microsoft
> knowledge base or tell me how to set up instant messenger
> on a Win2003 sever with winxp-pro clients network?
> Thanks