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I recently found this online messenger. It has been very helpful when it comes to making voice calls to MSN, Yahoo, and Skype on Linux (Ubuntu).
Agree with other comments here - its a great IM. Also it`s the best iphone IM app (including skype, icq, google talk, msn, jabber)
Imo.im is great for chat and conferencing but lacks screen sharing which is crucial for businesses. Web conferencing solutions like GoMeetNow http://www.gomeetnow.com provide chat, voice and video conferencing along with screen sharing.
perfect empty interface.using it with Google Chrome extension. works great.
Ease of use and obligatory https have made imo.im my favourite web-based IM service.