I have an MSDN subscription: try these keys. no cracks needed. i could be wrong but I think this is unlimited activation (meaning it doesn't expire). The key type says "retail". Again, I'm assuming that this means its the retail key and therefore no activation expiration. Again, I could be wrong. So far though all the stuff I've installed from MSDN subscription has never deactivated after a certain amount of time.
82M78-H278F-QXJD9-BKGMT-RYJHD
RGM9Q-8Q9XW-MVCJ6-6TYYX-2WFT9
RBHPQ-2XK37-2Q3P4-JYXTH-8WHXG
C34V7-JWXTQ-Y4QG6-FPTJK-HDCBC
33PB7-JTG4M-WKYKH-CBX22-VP6DY