India plays risky game with $2B Vodafone tax threat.

Vodafone (VOD) is urgently reviewing its options in India and overseas as the country moves toward a law that would retroactively apply a tax of over $2B on Vodafone's 2007 purchase of Hutchison Whampoa's Indian telecom venture. The law would come despite a recent ruling by India's top court that Vodafone wasn't liable for back-taxes. It might also give other foreign companies pause for thought about investing in the country