With the January 2021 release, the ability to edit Classic Content will be retired along with copying and moving:
We will still have the ability to view and send classic content.
Email Studio features not included in the retirement:
- View classic emails, templates, and content areas
- Access to Portfolio
- Sending classic email
- Landing Pages
- Email classic SOAP APIs
- Distributed Sending
Does any one know if "viewing" also includes viewing the HTML/AMPscript code of the emails and content? I would assume it does as Salesforce does not usually pull the rug from underneath you overnight with these sunsetting of features.