Beside the digestive issues that many face from dairy products, there are many potential health risks as well.
Got Milk? Got Cancer?
Here are a few links to help muddy the water some more. My advice? Stay clear! Eat as little dairy as you can, and get your calcium from green leafy veggies like Kale.
http://www.hsph.harvard.edu/nutritionsource/what-should-you-eat/calcium-full-story/index.html
http://www.preventcancer.com/consumers/general/milk.htm