Try MeGlobe, it’s web based, no installs needed and it supports AOL, MSN and Yahoo. It’s Free to use and even provides real time language translation to IM.
meglobe.com
You might try MeGlobe
Although it doesn’t allow for file xfer or chat logs it does is browser based, does have group chat and also provides real time language translation. If you have anyone on your team who is multi-lingual or have clients who speak a different language than you do this one might be the one to try. use it for collaboration and it works well for me. It’s at meglobe.com