An AOL Mail account may be deactivated if it is inactive for 90 days. To keep your AOL Mail account active, please sign in to your account at least once every 90 days.
When a mailbox is deactivated after 90 days without a log in, new mail may not be delivered to your mailbox. Incoming emails are bounced back to the sender. If another 90 days pass without any activity on the account (180 days total) your mailbox may be deleted. Any saved data -- email, photos, attachments -- will also be deleted. An inactive account is likely the answer to questions like "Why do I see the welcome message in my AOL Mail account?" or "Where did my email go?" or "Why is my email missing?"
If you haven't logged into your mailbox for 90 days, but then log in again between day 90 and day 180, your mailbox is reactivated and you will begin receiving new mail again. You may then continue using your mailbox as you normally would.
As stated in AOL's Terms Of Service, if a user doesn't log in to their account for 90 days (i.e., if an account is unused or dormant for 90 days), it is deactivated. For more information, please take a look at AOL's complete Terms Of Service.