Yahoo email upgraded their service.
If you log into your account, Yahooemail offers you to Upgrade (if you want)
They say on Yahoo:
BE A BETTER Pal!
We’ve built a better Yahoo! Mail, so upgrade to the all-new faster and easier version:
* Automatically know when mail arrives.
* Drag & drop messages into folders.
* Preview messages with reading pane.
* It’s FREE, and you can switch back to Yahoo! Mail Classic anytime.
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