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3-year horizon before trading up to next home: put windfall in savings, or pay off mortgage?
You may have to both save your windfall in a savings account and use it to pay down your mortgage. Almost every mortgage has some sort of pay-down option that allows you to pay off a percentage of the original principal without penalty. Any amounts above that will be penalized, most likely by the amount of interest the lending institution would have collected. Ask your lender what the penalties are and what penalty-free pay-down options you have. Knowing that and how much you will receive each quarter by selling the company stock will tell you how much of your money you need to put against your house and your savings account.