It is still a mess and ruins the end user experience. For example:
When a user sets up their zimbra preferences for create "new mail" as - pop - up - a - new - mail - in - a - new - browser - window, when clicking on a mailto link in another browser tab application, instead of zimbra operating as described, the browser proceeds to open zimbra inside that browser tab, then within zimbra open a zimbra tab with a new mail. What makes it worse is the page with the mailto link is lost. And it can actually get worse beyond that. But I will leave it there.