(last updated 2012-09-12)

Resource Identifier (RI) Scheme name: msnim
Status: provisional

Scheme syntax:
   Add a contact to the buddy list: msnim:add?contact=nada&example.com
Start a conversation with a contact: msnim:chat?contact=nada&example.com
Start a voice conversation with a contact: msnim:voice?contact=nada&example.com
Start a video conversation with a contact: msnim:video?contact=nada&example.com

Scheme semantics:
   Adding a contact, or starting a conversation in Windows 
   Live Messenger

Encoding considerations:
   Unknown, use with care.

Applications/protocols that use this scheme name:
   Can be invoked from a web page or via a run command 
   or an Internet Explorer browser URL (won't work with 
   Firefox 2.0.0.8). For web pages use this HTML: 
   <a href="chat?contact=nada&example.com">Click to chat!</a>

Interoperability considerations:
   Unknown, use with care.
Security considerations:
   Unknown, use with care.
Contact:
   Registering party: Alexey Melnikov <alexey.melnikov&isode.com>
   Scheme creator: Microsoft
Author/Change controller:
   Either the registering party or someone who is verified to represent
   the scheme creator.  See previous answer.
References:
   http://en.wikipedia.org/wiki/Windows_Live_Messenger 

(file created 2012-09-12)