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This is just a guess, but I suspect that Google was already aware of the vulnerability. The attack vector was probably something new though. It's a lot easier...and quicker... to lock a door that you know you left open than it is to fix a hole knocked through your wall. Or perhaps Google is just admirably agile for a company its size. Microsoft has traditionally not been as willing to release betas as Google, and this probably carries over to things like patches as well. Whereas Google cranks things out that may not be perfect then tweaks them over time, Microsoft generally tests, tests and retests before release, which obviously takes time to complete.