This questions isn't quite as simple as it might first appear. Here's the catch.
I do the IT for a UK based charity which teaches disabled people to use PCs and the Internet. The PCs we are donated range from PIII 500MHz upwards. 80% of the students use modems and the rest Broadband. The operating systems are 98 through to XP SP2. Get the idea to the scope?
To help support users at home we are supplying them with VNC so we can take over their desktops. But we want to also give SkyPe or Messenger for voice communication and maybe in extreme circumastances video (NOT a big requirement).
Our experience so far is that SkyPe is by far the easier to install then MSN/Messenger. And both products give variable results. We've had both work perfectly on broadband-to-broadband connections and also had the voice quality degenerate so badly you think you we're talking to a Dalek.
There is no right or worng answer here but could the Experts give me their views on how we address this issue.