My mom & dad purchased a MagicJack in January of 2009 and tried to use it on their Windows XP machine. Unfortunately, it did not work reliably. Many calls had choppy sound and some would not go through at all. If you rebooted the PC it might work good for an hour or two, but inevitably, it would start having problems withing a few hours. After months of frustration, I took their MagicJack home & tried on my Windows XP machine. The result was the SAME, inconsistent sound quality. Have to constantly restart to get it to work, and... read full review »