Recently AOL lost millions of dollars when their domain name expired and it was taken over by a porn company and effectively, professionally and legally ransomed back to them. There are various groups that specialise in buying domain names as soon as they expire and then sell them back to the original companies for high sums of money. This is perfectly legal but can often end up costing people a lot of money. Make sure that you have some kind of Disaster Recovery plan today, to avoid this happening before someone get the chance.