I was suprised to learn that OLP offered by Microsoft is only valid for 2 years. Afterwhich, it's illegal to use the software... I wonder what if the OLP/OEM licenses that we purchase from Dell (with the servers) have the same time limits... In this case, it's probably better to buy full packages, pay once and be done with (other then having a bunch of CDs and licenses number to track) but at least you don't have to renew/repay every 2 years...