Can Membership offer a "first two months free" type of deal?

Hi There,

I am migrating users from an old system into Membership, and I'm going to need to get them to re-signup to get into the new system. Since their old account will be shutting down, I'd like to give them an incentive to stay on as a customer, and offer something like "Move your account over and get two months free!"

The main thing I want them to commit to is setting up their new account and their Paypal subscription. Obviously, they can cancel it, but I don't want to give them their 2 months and then have to chase them again to pay up. Can I set up a "free trial" period with paypal?