One of my contacts who is running Skype for Windows has also installed Magic Jack. Since then we have had trouble connecting with Skype and I suspect something has gone wrong with their setup. What should I advise them to check? What happens is that when I call I can hear them clearly but they cannot hear me at all.

They will need the "SkyjackPlugin" software plugin to concurrently use magicJack and Skype from the same phone. It can be downloaded at http://www.pcphonesoft.com .

To place Skype calls just dial * before the number you want to call. Speed dial numbers are available for dialing other Skype users. Regular magicJack calls are placed as normal. For incoming calls, just answer the phone when it rings.