Hello @KylieB94 ,
Due to the legal and Compliance nature of unsubscribes, they must be done on a case-by-case basis. We encourage you to call our general support so they can work live with our higher level technical team to see if they can reverse your accidental mass-unsubscribe.
I'd recommend taking a look at our Knowledge Base for its plethora of helpful articles to ease the transition to our current, mobile-friendly email builder. For starters, you may be interested in this article on transitioning between the two builders. The current builder’s emails can be copied.
If you'd like one-on-one guidance, our general support agents can work with you live on the phone to get started as well. You can also request to have your legacy template remade in the new editor by one of the professional designers, or to have an entirely new one created for a price. If you’re unable to call in, you can also submit a form directly to our designers to have a template converted.
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