What will happen to InterMiles which I have earned in the past (prior to the introduction of Activity-based expiry)?

There will be no change to the validity dates of InterMiles accrued prior to Jun 30, 2018. For e.g. If 100 InterMiles are stamped for expiry in Jul 2020, they will be reviewed for expiry basis the new Activity based expiry rule only on Jul 31, 2020 and not before thereby honoring the expiry dates, they were stamped for.