It doesn't. It requires Windows XP or better.

how is majicjack in windows?? do you like the service?

It works great. I have been in contact with Majicjack and they are
working on a Linux version. I was not given a time line on when it might
be available.

People have run it by using VirtualBox. Other than that. No hack has hack into
yet. So you'll get this answer. I love their answer.
http://www.magicjack.com/2/faq/