With a paid account, Apple does delete everything, but they give you a 30 day grace period. During that time, you are not able to access your data, but it is still there in case you renew.
I do not know about the trial version, but they may handle it the same way. I don't know how important the information in your account was, but it may be worth buying the subscription to find out.
Incidentally, you can buy .Mac online at places like Amazon at prices that are usually significantly cheaper than Apple offers through their other stores. The Amazon boxes can also be used to renew existing accounts.