So decided to delete your Yahoo account permanently. Deletion of it will delete your Yahoo! ID, Mail address and all public profiles also this includes your information which is stored in databases across the internet. This will also delete your setting across Yahoo including your access to GeoCities, Yahoo Briefcase and many other website which uses yahoo ID for login. Here is the simple tutorial which will guide you on How to delete your Yahoo email account permanently.
Follow these instructions to delete your Yahoo account permanently:-
This 3 steps tutorial will make sure that your account is marked for deletion and you can’t further login to your account. Within 90 days Yahoo! will delete all the data associated with your account. Yahoo reserves rights to allocate the same ID to other users if you have deleted your account.
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That is a good option of making the username available to others after one has deleted it. After all it was the users choice to delete it.