Unfortunately, it is no longer possible to switch back to Yahoo classic mail. All past versions have been discontinued.
There is a way to change to a classic-like options by following the method provided below. This will make the mailbox resemble the classic style. Feel free to change back by following the steps provided below, but select "Full-Featured" instead of "Basic," or click the link provided in the upper right-hand corner of the mailbox under the profile name.
- Go to Yahoo mailbox
- Go to "Settings" Locate the gear symbol next to the profile name with the mouse. A drop-down will appear, then click "Settings." A settings popup box will appear with "Viewing Email" automatically selected.
- Click the "Basic" bubble under "Mail Version"
- Click "Save"