Sign in & log in problems

"Ymail," a division of Yahoo!, is not the same as the Yahoo! email service.
The main different revolves around the URL at the end of your email address.

Instead of "@yahoo.com" these addresses are written as "@ymail.com."
This slight variation might confuse you about how to log into your Ymail account.

The login instructions are similar to that of Yahoo! mail. Additionally, you can recover your ID or password if you have forgotten it.

Visit the Yahoo! login page by typing "ymail.com" into the URL bar.
This takes you to both the Yahoo! email sign in and the Ymail sign in.

Type your username into the "Yahoo! ID" box.
This is the part of your email address that comes before "@ymail.com."

Type in your password.
If your password doesn't work, or you don't remember it, choose the blue "I Can't Access My Account" from the bottom of the sign in box.

Choose the option that describes your situation best. Options include: "I Forgot My Password", "My Password Doesn't Work", "I Forgot My Yahoo! ID" and "My Account May Have Been Compromised". Press "Next."

Follow the on-screen directions to set a new password or recover your ID.
http://https//login.yahoo.com/config/login_verify2?&.src=ym

One of the drawbacks of free email services is that they're easy to forget you have an account. Yahoo! Mail is just one of those free email services.
Say a few months go by, you've turned your attentions elsewhere, but you remembered you have a Yahoo! account and you want to check your email.
But after you log in, it informs you that your Yahoo! Mail is no longer active. What do you do?

Log in to your Yahoo! Mail account as usual.
A message will appear that says your account has been deactivated due to inactivity.
Reactivate your Yahoo! Mail by clicking on the "Reactivate Your Yahoo! Mail address" link that is located at the bottom of the page.
Sign into your account at least once a month to avoid automatic deactivation by Yahoo! in the future.

"Ymail," a division of Yahoo!, is not the same as the Yahoo! email service.
The main different revolves around the URL at the end of your email address.
Instead of "@yahoo.com" these addresses are written as "@ymail.com."
This slight variation might confuse you about how to log into your Ymail account.
The login instructions are similar to that of Yahoo! mail. Additionally, you can recover your ID or password if you have forgotten it.

Visit the Yahoo! login page by typing "ymail.com" into the URL bar.
This takes you to both the Yahoo! email sign in and the Ymail sign in.
Type your username into the "Yahoo! ID" box.
This is the part of your email address that comes before "@ymail.com."
Type in your password.
If your password doesn't work, or you don't remember it, choose the blue "I Can't Access My Account" from the bottom of the sign in box.
Choose the option that describes your situation best. Options include: "I Forgot My Password", "My Password Doesn't Work", "I Forgot My Yahoo! ID" and "My Account May Have Been Compromised". Press "Next."
Follow the on-screen directions to set a new password or recover your ID.

http://https//login.yahoo.com/config/login_verify2?&.src=ym

"Ymail," a division of Yahoo!, is not the same as the Yahoo! email service.
The main different revolves around the URL at the end of your email address.
Instead of "@yahoo.com" these addresses are written as "@ymail.com."
This slight variation might confuse you about how to log into your Ymail account.
The login instructions are similar to that of Yahoo! mail. Additionally, you can recover your ID or password if you have forgotten it.

Visit the Yahoo! login page by typing "ymail.com" into the URL bar.
This takes you to both the Yahoo! email sign in and the Ymail sign in.
Type your username into the "Yahoo! ID" box.
This is the part of your email address that comes before "@ymail.com."
Type in your password.
If your password doesn't work, or you don't remember it, choose the blue "I Can't Access My Account" from the bottom of the sign in box.
Choose the option that describes your situation best. Options include: "I Forgot My Password", "My Password Doesn't Work", "I Forgot My Yahoo! ID" and "My Account May Have Been Compromised". Press "Next."
Follow the on-screen directions to set a new password or recover your ID.

http://https//login.yahoo.com/config/login_verify2?&.src=ym

One of the drawbacks of free email services is that they're easy to forget you have an account. Yahoo! Mail is just one of those free email services.
Say a few months go by, you've turned your attentions elsewhere, but you remembered you have a Yahoo! account and you want to check your email.
But after you log in, it informs you that your Yahoo! Mail is no longer active. What do you do?

Log in to your Yahoo! Mail account as usual.
A message will appear that says your account has been deactivated due to inactivity.
Reactivate your Yahoo! Mail by clicking on the "Reactivate Your Yahoo! Mail address" link that is located at the bottom of the page.
Sign into your account at least once a month to avoid automatic deactivation by Yahoo! in the future.
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

I CANT LOGIN TO MY ACCOUNT,WHAT SHOULD I DO TO GET MY OLD EMAIL ADDRESS?

If you registered for a Yahoo! account with either a ymail or rocketmail email address, be sure to include @ymail or @rocketmail when you sign in to your Yahoo! account. Your Yahoo! ID is your full email address.

If you registered using a ymail email address, sign in to Yahoo! by typing your complete username/email address: [email protected].

Likewise, if you have a rocketmail email address, log in to Yahoo! by typing your complete username/email address: [email protected].

go to www.yahoo.com select 'sign in' which is located under the search bar. You'll need to remember your yahoo id - usually an email address, and you'll need your password.
Once you've signed in, select 'mail' under the yahoo sites side bar, select inbox and you'll see your mail.

I suggest you to check whether your email address and password is correct or not, by logging in at the www.yahoomail.com website, If you are able to login then your account exists and the email address and password is correct.
If it shows wrong password, try forgot password.

If you are able to login to your account in website, only you cannot login in yahoo messenger, There might be some problem in yahoo messenger, I suggest you to download the recent version of yahoo messenger and try logging in, if problem persists check your internet connectivity, Sometimes we couldn't login if there is a problem in internet connection.
There may also be problem with windows firewall settings.

And also check whether the yahoo messenger is added as exception in the windows firewall or not, If not add the yahoo messenger to exception list.

It is possible that someone tried to access your account that is why it got locked up. Usually you will get an email to your alternate email address about your account,