This feature doesn't work anymore!
https://mm.alitalia.com/it_it/booking/apvsearch.aspx
It does but you have to be logged in
protip: to make sure you are logged in click on your miles to see the accruals list and make sure you can actually see it - the mm site is somewhat separated from the main site
protip2: if you are using a work laptop or anything full of policies and restrictions run your browser as administrator or add alitalia to trusted sites