Couldn't find this answer, not even sure if its doable, MS licensing can be so confusing sometimes.
So I know on home versions of 365, you can buy and stack licenses to extend the sub out up to 5yrs I think. Can this be done with say 365 Business Standard if I'm buying the keys from a distributor? Say I have a client with a need for 30 licenses. Could I offer them a 2yr or 3yr sub and then buy 60 or 90 1yr subs and stack them? Or would it be more like buy 60 or 90, activate the first 30, then keep the extras locked away until the year is up and then break out the next 30 keys?