Interoperability between instant messaging (IM) clients is something a lot of users have wished for. More specifically, we wish it was standard and provided right out of the box instead of having to turn to third parties such as Adium, Digsby, Trillian, or Pidgin. Yet there seems to be a problem with the concept of interoperability for the companies of the more popular IM clients.
Recently Yahoo and Google announced a partnership for advertising. Yahoo will run advertisements provided by Google alongside the companies own advertisements. However, what was overlooked was the statement that both companies "agreed to enable interoperability between their respective instant-messaging services, bringing easier and broader communication to users".
Companies like Yahoo, Google, and Microsoft try to do things that are beneficial for their entire community and not just for small portions of it. Stephan Shankland noted that:
"AOL said in a statement, in effect, that I am indeed an anomaly. "We have no evidence that interoperating with other consumer IM services is of great interest to AIM users," the company said."
This may come as a huge "ouch!" to early adopters, social media fanatics, and generally those that network online 24/7. Such users only represent a small portion of these immense networks. While they may be the users that push the envelope and can help the tools that these companies produce become better and more productive, AOL understands that the average users probably won't care.
In acknowledging this, interoperability becomes more of a distant dream than a reality. In layman's terms, it seems interoperability won't happen unless there's a major push from the majority of users or it's somehow beneficial financially for any of the parties involved. This may be a sad conclusion for some.
If Yahoo and Google do open up their respective clients to one another, this will be a very beneficial move to both parties because they have already integrated other platforms: Yahoo with Live Messenger and Google with AIM. Also, If it does happen users will at least have the option to pick between the two and get the best of the majority of these networks. If you have the majority of your contacts on Yahoo and Windows Live Messenger, Yahoo Messenger would be the best platform for you with the added benefit of Google Talk interoperability. If you have more contacts on Google and AIM, then Google Talk would be the better choice with the benefit of integrating your Yahoo contacts too.
However, is this really enough? I don't think it'll keep users from using third party clients that enable interoperability between all of these networks and more. Digsby is poised to take a serious amount from the market share of the standard clients because of its interoperability not only with IM clients, but also because of the integrated social networks and even email. It makes me wonder if maybe Digsby is poised to be the "Firefox" of instant messaging if the dominating players aren't careful. What do you think?
See also: Poll: Which Instant Messaging Client(s) Do You Use?

There are more and more ways to get your instant messaging done, with a large number of new online and offline clients from third parties. With so many instant messaging options, it's hard to figure out which one to use. Below, we've listed a large number of online and offline instant messengers, as well the various protocols supported by each, so that you can more easily find the one that's right for you. There's really not all that much difference between each except in interface and supported protocols. The best option for you will likely be the one that supports the networks your friends connect to and has an interface that you feel comfortable using. If there are any we've missed, please mention them in the comments. (Note: we did not link to any official offline clients.)
Name: Meebo
Supports: AIM, Yahoo!, MSN, GTalk, ICQ, Jabber
Name: FlickIM
Supports: AIM, Yahoo!, MSN, GTalk, ICQ, Jabber
Name: Kool IM
Supports: AIM, Yahoo!, MSN, GTalk, ICQ, Gadu-Gadu, Xfire
Name: eBuddy
Supports: AIM, Yahoo!, MSN, GTalk, MySpace
Name: ILoveIM
Supports: AIM, Yahoo!, MSN, GTalk, ICQ, Jabber, webcams/video chat
Name: RadiusIM
Supports: AIM, Yahoo!, MSN, GTalk
Name: Imo.im
Supports: AIM, Yahoo!, MSN, GTalk
Name: Mabber
Supports: Proprietary Jabber-based (aimed at mobiles)
Name: IMUnitive
Supports: AIM, Yahoo!, MSN, gim (proprietary)
Name: Snimmer
Supports: AIM, Yahoo!, MSN, GTalk, ICQ, Jabber
Name: EasyMessenger
Supports: AIM, Yahoo!, MSN, ICQ, Jabber
Name: MessengerFX
Supports: MSN
Name: IMhaha
Supports: AIM, Yahoo!, MSN, QQ
Name: Google Talk
Supports: GTalk, Jabber
Name: Yahoo! Web Messenger (web.im)
Supports: Yahoo!, MSN
Name: MSN Web Messenger
Supports: Yahoo!, MSN
Name: AIM Express
Supports: AIM
Name: ICQ2Go
Supports: ICQ
Name: JWChat - Jabber Web Chat
Supports: Jabber
Name: Trillian Astra (closed alpha)
Supports: AIM, Yahoo!, MSN, GTalk, ICQ, Jabber, MySpace, iChat
Name: Trillian
Supports: AIM, Yahoo!, MSN, GTalk, ICQ, IRC
Platforms: Windows
Name: Pidgin
Supports: AIM, Yahoo!, MSN, GTalk, ICQ, Jabber, Gadu-Gadu, QQ, MySpace, iChat, IRC, Lotus, Novell
Platforms: Windows, UNIX
Name: Adium
Supports: AIM, Yahoo!, MSN, GTalk, ICQ, Jabber, Gadu-Gadu, QQ, iChat, Lotus, Novell, LiveJournal
Platforms: Mac OS X
Name: AirTalker
Supports: AIM, Yahoo!, MSN, GTalk, ICQ, Jabber, MySpace, Friendster, Flickr, YouTube, Twitter, blogging
Platforms: Windows, Mac OS X (via Adobe AIR), also has web version
Name: Miranda IM
Supports: AOL, Yahoo!, MSN, ICQ, Jabber, Gadu-Gadu, IRC, IAX, Tlen, Netsend
Platforms: Windows
Trillian Astra, the next version of the popular Windows multi-client chat application Trillian, is being developed for the Mac. Cerulean Studios, the makers of Trillian, has released a limited and experimental Mac version to approved testers of their new Astra platform. Hopefully a working version will be made available for general release someday; Astra itself as been in invite-only Alpha stage for nearly a full year now.
Testers can grab the download here and readers interested in becoming testers can go here.
Trillian on Mac is something that many people have waited for for a long time. It's an aesthetically pleasing, feature rich service with a very loyal group of users. Trillian Astra users can chat seamlessly with friends on Yahoo!, ICQ, AIM, Bonjour, Windows Live, Google Talk and MySpace IM. There's a web component of the new service, an RSS ticker and more - see a screenshot of the pared down Mac version below.
The particulars of this service as opposed to others are better experienced than they are described. Other multi-client chat tools include the open source Pidgin (formerly known as GAIM) on Windows and Adium on Mac.
See a screenshot of the current Mac build below the fold.

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