That was in 2002. 6 to 7 million today.
And counting....
Islam is already the fastest-growing religion in Europe. Driven by immigration and high birthrates, the number of Muslims on the continent has tripled in the last 30 years. Most demographers forecast a similar or even higher rate of growth in the coming decades.
http://pewforum.org/docs/?DocID=60
Islam is the fastest growing religion and the second largest religion in the world
http://www.islamicweb.com/begin/results.htm