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Yahoo! will be releasing usernames that have not been logged into for over 12 months
Why that might be a bad idea (Briefly, because it means someone malicious can take such usernames and use them to attempt to do password resets and gain access to anything linked to them, such as website accounts, if it was used as a recovery address for anything else, purchasing a domain name, etc.)
So, go log into Yahoo if you want to be sure to keep a username, or even just protect whatever you might have used it to sign up for or linked it to, even if you don't currently use it.
Why that might be a bad idea (Briefly, because it means someone malicious can take such usernames and use them to attempt to do password resets and gain access to anything linked to them, such as website accounts, if it was used as a recovery address for anything else, purchasing a domain name, etc.)
So, go log into Yahoo if you want to be sure to keep a username, or even just protect whatever you might have used it to sign up for or linked it to, even if you don't currently use it.