I haven't used MSN so I can't comment on that but, like Technotiger, we use Skype a lot talking to relatives in Australia and the USA. The quality is equal or better than on with a conventional phone to these places.
I've used MSN/Windows Live for ages, but I've found that lately it has become worse and worse for voice calls. Loss of call, extremely poor quality - I think the newest versions of Messenger is intended for file transfer around businesses with very high bandwidth lines.
I switched to Skype a couple of days ago for voice calls is far superior (although file transfer is slow).
Tried both and think Skype is wonderful both for PC to PC which is free or to other phone which is very cheap. I have video cam setup which is very good. I use my house phone to talk as cant handle headphones (hearing aids and speaker feed back)etc.
Yes, I have used Skype often but not MSN. Skype is very clear (especially if you've got decent speakers, it is far superior to phone for quality). (bluto1, my name denotes my country and year of birth)
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