But a meeting invite from the past may contain other information I want in the future. Deciding what is useful to keep and what can be safely trashed is a very

But a meeting invite from the past may contain other information I want in the future. Deciding what is useful to keep and what can be safely trashed is a very tricky (if not impossible) problem. As for generic expiry of individual emails, Lotus Notes has been doing that for years and years. It doesn't provide expiry of emails that go outside of Notes, but that is not what it's trying to solve. Internal data retention policies become much easier to handle if it's enforced by every user's mail client.