Most attempts at producing a unified standard for the major IM providers (AOL, Yahoo!
However, while discussions at IETF were stalled,  Reuters signed the first inter-service provider connectivity agreement on .  This agreement enabled AIM, ICQ and MSN Messenger users to talk with Reuters Messaging counterparts and vice-versa.  Following this, Microsoft, Yahoo! and AOL agreed to a deal in which Microsoft’s Live Communications Server 2005 users would also have the possibility to talk to public instant messaging users.  This deal established SIP/SIMPLE as a standard for protocol interoperability  and established a connectivity fee for accessing public instant messaging groups or services.  , Microsoft and Yahoo! announced that by the 3rd quarter of 2006 they would interoperate using SIP/SIMPLE,  which was followed, in , by the AOL and Google strategic partnership deal in which Google Talk users would be able to communicate with AIM and ICQ users provided they have an AIM account. 
- Combine the many disparate protocols inside the IM client application .
- Combine the many disparate protocols inside the IM server application. This approach moves the task of communicating with the other services to the server. Clients need not know or care about other IM protocols. Continue Reading