I did for once...but then Yahoo n MSn are really good for webchat etc.
Yes, I use Skype because the video conference is better as compared to Yahoo Messenger.
I use just e-mail and if hard pressed, Yahoo messenger. Never felt the need to complicate my life further by using Skype.
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Yes, I use skype for call on a mobile or landline phone from PC because it has cheap rates. Skype is the most popular voice communication service in the world.