[...] that he is leaving, he is entitled to "the severance benefits provided for in his Employment Offer Letter," Yahoo says. All his existing stock vests at once: "... the RSUs that would have vested within 12 months after such termination shall immediately vest, and the Stock Options that would have vested in the 12 months following termination of employment if the applicable performance criteria were satisfied, shall remain subject to satisfaction of the performance criteria and, if such criteria are satisfied, vest as if you were employed on such vesting date."