I have yahoo email account and I want to sync it to my new Lenovo laptop but it keeps saying my password email account is outdated?

Choose Settings > Manage Accounts.
Choose the account that's out-of-date to display the account settings dialog.
Choose Change mailbox sync settings > Advanced mailbox settings. You may have to scroll down in the dialog to see Advanced mailbox settings.
Check the boxes for Require SSL for incoming email and Require SSL for outgoing email and then choose Done > Save.

If you haven't accessed the account "in years", then most likely all your profile information is gone. I would consider that account as lost.

Try to create a new Yahoo account with the email name you had before. If the account still exists, you will get an error message from Yahoo, saying that name is already taken. If years have passed, then another owner likely has that address with their own password.

I urge everyone to have at least two email accounts - each on different providers. When setting up the account profile, be sure to list the other email account as your alternate. This is so the management of your email service can send you a temporary password to the alternate email address.

If you gave him your password and your username for your email account or for your messenger account then he can log in to your account and change the password to one only he knows. If he can get into your email he can read all your old emails. If you use the same password for multiple accounts, he can keep guessing at what accounts you might have and try the password. Even if you have accounts that don't use the same password but use your email address to log into, he can try to log into those with your email address and say he doesn't remember your password and they'll email him a new one.
Sounds like you're screwed. Call your ISP (Internet service provider)

Reactivate your old Yahoo email account.
https://answers.yahoo.com/question/index?qid=20120415011129AAi9TjA
Reset gmail password, which I believe will be sent to the reactivated Yahoo account above.
https://www.google.com/accounts/recovery/
Change email associated with your google/gmail account from the old Yahoo eamil account you just reactivated, to your new Yahoo account.
https://support.google.com/plus/answer/1045580?hl=en

Numerous monitoring sites are reporting this problem with Yahoo and AT&T (which uses Yahoo mail) and I have the same issue. It is clearly a repeat of the numerous outages and problems that seems to coincide with Yahoo after they converted to the new "improved" mail version. It's not your device or account, it's a Yahoo problem.

When you sign up for a free Yahoo! account, you gain access to the extensive features of the Yahoo! community and receive a free email account.

As with any account, it is a wise idea to change your Yahoo! password a few times a year in order to ensure its security.

Knowing where to go in Yahoo! to change your password will allow you to do it quickly.

Sign into your Yahoo! email account.

Click on your Yahoo! name at the top of the webpage to access drop-down options.
Select the "Profile" option.

Your account page will open.
Place your cursor over "Account Info" in the toolbar.
Options will again drop down.

Click "Change Password."

Type in your current Yahoo! email password in the first text box.
Enter your new Yahoo! password in the lower two text boxes.

Click "Save."

Your Yahoo! password is now changed.
http://help.yahoo.com/l/us/yahoo/smallbusiness/bizmail/general/general-41.html

also you might try this link
http://windows.microsoft.com/en-AU/windows/outlook/account-temporarily-blocked

you can access your yahoomail from the previous link "http://mail.yahoo.com" ...
here you have to enter the username of yahoomail & password of ATnT...
For accessing atnt mails go on "http://att.yahoo.com"...
ther type your atnt email address as username and password for atnt..