Lost data
I had emails that had been stored in MY account for almost 20 years. TWENTY YEARs! That got deleted. How dare yahoo think they can get rid of MY personal emails without my knowledge!
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If your account has had no activity for 365 days, then the account is deactivated. We communicate this a few times which includes sending you an email to your alternative email account, so make sure that is updated. If you need help reinstating, contact our CC team at help.yahoo.com. They have the tools to help with these issues. Hope this helps!