For a few years Google offered a free version of Google Apps, and even after that was discontinued you could get a free Apps service with a new Dreamhost domain (I think that’s been discontinued). It was a great deal; I ended up with a dozen or so. One of them has provided all of our family email and calendars since 2007; even after Google ended the new signups they let freeloaders like us hang around.
Recently though I’ve received notices from Google warning that they will close unused Google Apps accounts. So if you have some Google Apps you’d like to keep, be sure they are setup with a valid forwarding address  and periodically log in and send an email.
In one case I did authenticate, but I still received a second notice of pending termination. I hope that’s just a glitch.
 In some cases an Apps account is also associated with a companion Domain, so if the Apps account is lost the domain control may be lost too. Check.