We used it as well. One of the kids in my year searched for "e" in the address book, and then sent a mass email saying "You have an 'e' in your name". He repeat

We used it as well. One of the kids in my year searched for "e" in the address book, and then sent a mass email saying "You have an 'e' in your name". He repeated that with all the vowels and some other letters, and then the server crashed.