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What typically happens to unvested stock during an acquisition?
I've been through two instances where I worked for a public company that was merged (for stock) into another company.  In both cases the options I had were replaced with equivalent options in the merged company with the number of shares and strike price adjusted at the same rate as the actual stock was converted, and the vesting terms remained essentially the same.  In other words, the options before and after were in essence equivalent.