Thanks jvstratum.
In 5.10.11 Essential I can select:
For example:
When a new user is created, send an e-mail to ...
When a user unsubscribes from a list, send an e-mail to ...
When a user unsubscribes from all Lists, send an e-mail to ...
When a user refuses to receive e-mails, send an e-mail to ...
etc.
But I can't in 6.6.1
In 5.10.11 Essential, under Global Statistics, I can see a list of who has unsubscribed.
In 6.6.1 I cannot see a way to easily see who has unsubscribed. And because I no longer get any emails alerting me to who has unsubscribed, I cannot work out a way to see who has unsubscribed easily. I would have to scroll through all contacts, one-by-one and click each one to see. Please correct me if I'm wrong, if there is a way to easily view this information.
I believe these existing features in 5.10.11 (as outlined above) are essential and should be included as part of "Essential" in version 6.