We couldn't match the Yahoo! ID you entered with information in our database.

HOW LONG HAS IT BEEN INACTIVE ?

Your Yahoo ID is linked to a broad array of Yahoo services, from Yahoo Messenger to online games. A Yahoo ID must be deleted from a laptop or desktop, not a mobile device. Only get rid of your Yahoo ID if you're certain you'll never need it again, because there is no option to change your mind and get your ID back once it's gone.

Deleting a Yahoo ID
When you delete a Yahoo ID, you lose access to all programs associated with it, including Yahoo Mail, Yahoo Groups and Yahoo Finance Portfolio. Deleting your Yahoo ID will not remove your listing from the Yahoo People Search, however, so your profile will continue to appear in search results unless you delete your listing before deleting your ID. Lost Information b> When a Yahoo ID is removed from the system, Yahoo deletes all of the data associated with the account, including your email messages. You cannot recover this information once it is removed; creating a backup copy of your data on a computer or external storage device is the only way to preserve it for future reference. b> Reactivating Dormant Email As long has your Yahoo email has only gone dormant -- and not been deleted as the result of an ID termination -- you can reactivate the account. Yahoo automatically makes an email account dormant if the user hasn't signed in more than four consecutive months. To reactivate such an email account, you must sign in via computer using your Yahoo ID and password, and choose "Reactivate Without Account Protection." Yahoo permanently deletes old emails when an account is deactivated, but you can resume sending and receiving email once you reactivate the account. b> Considerations b> Some premium services are not cancelled along with a Yahoo ID deletion. If you signed up for a paid service, such as Yahoo Mail Plus, the company recommends manually canceling the service -- independent of your Yahoo ID deletion -- to avoid future bills. Canceling a Yahoo ID doesn't disqualify you from signing up again in the future with a new ID, but you cannot reactivate the same ID. Hope this helps.

Your Yahoo ID is linked to a broad array of Yahoo services, from Yahoo Messenger to online games. A Yahoo ID must be deleted from a laptop or desktop, not a mobile device. Only get rid of your Yahoo ID if you're certain you'll never need it again, because there is no option to change your mind and get your ID back once it's gone.

Deleting a Yahoo ID
When you delete a Yahoo ID, you lose access to all programs associated with it, including Yahoo Mail, Yahoo Groups and Yahoo Finance Portfolio. Deleting your Yahoo ID will not remove your listing from the Yahoo People Search, however, so your profile will continue to appear in search results unless you delete your listing before deleting your ID. Lost Information b> When a Yahoo ID is removed from the system, Yahoo deletes all of the data associated with the account, including your email messages. You cannot recover this information once it is removed; creating a backup copy of your data on a computer or external storage device is the only way to preserve it for future reference. b> Reactivating Dormant Email As long has your Yahoo email has only gone dormant -- and not been deleted as the result of an ID termination -- you can reactivate the account. Yahoo automatically makes an email account dormant if the user hasn't signed in more than four consecutive months. To reactivate such an email account, you must sign in via computer using your Yahoo ID and password, and choose "Reactivate Without Account Protection." Yahoo permanently deletes old emails when an account is deactivated, but you can resume sending and receiving email once you reactivate the account. b> Considerations b> Some premium services are not cancelled along with a Yahoo ID deletion. If you signed up for a paid service, such as Yahoo Mail Plus, the company recommends manually canceling the service -- independent of your Yahoo ID deletion -- to avoid future bills. Canceling a Yahoo ID doesn't disqualify you from signing up again in the future with a new ID, but you cannot reactivate the same ID. Hope this helps.

you might be using the old version here's a link with the info, http://help.yahoo.com/kb/index?locale=en_US&page=content&y=PROD_MSNG&id=SLN14&impressions=false
hope it helps.

You couldn't access because of password wrong, ID wrong, or something else? Did you get any error message when you trying to access? In case you can't access because you forget ID and password, then you can have it reset by go to yahoo.com, click on Mail, and click on I can't access my account, fill out the information to have your ID or password reset.
Thanks

Take a look here:
http://answers.yahoo.com/question/index?qid=20061030073753AAffD0p

I think there is no easy way, but If I were you I would just ignore it exists, it makes no difference.

I've got several ideas to try to get around "Invalid ID or password. Please try again."

• Set your CAPS LOCK key correctly. Passwords are case sensitive. Be sure to keep this in mind when entering your password.
• Wait up to 24 hours. If you recently requested a new password or changed your password, this allows your account to update.
• Sign in with the correct Yahoo! ID. Make sure that you are using the correct Yahoo! ID when signing in to your account. If you forgot your Yahoo! ID, you can search for your Yahoo! ID online.
• Delete your cookie files. A cookie is a small piece of information stored by your browser that helps identify you. If your cookie isn't being accepted correctly, you'll be logged out of your account as soon as you move to a different page.
  To delete your cookies, close all browser windows, find the "cookies" directory, and delete the cookie files inside. To find cookies directories on a PC, search for "cookies" using the Search function in your Start menu that pops up from the lower-left corner. On a Mac, press Command-F to start Spotlight, which searches your system.
• Clear your browser's cache. At times, it's necessary to clear your browser's cache . The cache is the memory your browser uses to store content of the web pages that you visit. Storing that content lets your browser load those same pages more quickly the next time you visit them.

If you're still having problems after trying these steps, please request a new password. When you receive your new password, you can change it.

Is that your own account?

If you want to permanently delete your YAHOO! ID you will lose access to all networks where you registered using that YAHOO! ID.

1. You need to login on your Yahoo! Mail first. Click HERE to login.
2. After successful login, You will see "Terminating your Yahoo! Account" page.
3. Enter the credentials needed and confim the request. Yahoo! says, Your account will be deleted from registration database in approximately 90 days.

If you go to the Help page for Yahoo and read about deleting your account, you'll see at least two places where you are told that you will not be able to reactivate your account.

The Help page link is:
http://help.yahoo.com/l/us/yahoo/edit/ch...

The first caution says:
Please be sure you want to delete your entire account as you will not be able to reactivate it after the account has been deleted. You are always welcome to sign up again for a new account.



And the second one says:
Please complete the deletion process only if you are certain you would like to remove your entire Yahoo! account and any features you have personalized within the account. After the deletion process is initiated, your Yahoo! account can never be recovered.

It looks to me like you'll have to sign up for a new account. Maybe you can get the same Yahoo! ID (but I kind of doubt it).

I wish you good luck in straightening out your situation.

i thinj making a new yahoo address is your best bet. you probably went to somewhere they probably forbid and deleted your yahoo account.

During your initial signup, there is a process to merge your old Yahoo! login ID with your new AT&T Yahoo! DSL ID (your @sbcglobal.net login). 

If you did not do this process, it would explain why none of your old information is accessible if you log in with your new information, but you should still be able to access your old Yahoo! information by signing in with your old Yahoo! ID and password.