May miles earned expire?
According to the MilleMiglia Program Rules and Regulation (art.5.19), if there has been no miles earning activity with Alitalia, Air One or one of the airline or commercial partners in the last 24 months, your miles could expire.
To check if you have any expiring, check your balance or call the MilleMiglia call-centre. To renew miles validity all you need to do (before expiry date) is to do anything that foresees earning of miles: a flight with Alitalia or Air One or one of the airline partners, or use one of the program’s commercial partners services.