yeah, oem version gives your 30 days. but I don\'t recommend buying oem, not unless you trust your store, because the activation number is placed ON THE OUTSIDE IN FULL VIEW on the oem version. That means that when other people can just take a look at the activation number and copy it down and use it to activate pirated copies of the software, just as long as they get there before you. when I bought xp my activation number was already used! so I had to shell out another 4000 pesos for a SECOND copy. I was really mad.