Can't get back to classic yahoo mail - Yahoo Mail

try this & see if it works for you

How to change back to Yahoo
Log in to your yahoo mail account
In your web browser go to the yahoo mail home page sign in to your account using your yahoo ID and password, then click the yellow sign in button. Once you've successfully logged in you'll see your email folders on the left and the what's new and inbox tabs in the middle.
Choose the mail classic option
On the upper right side of the page there are three links -- Mobile, Options, and Help. Click Options, and when the drop down menu appears, choose mail classic
Confirm that you want to switch back
A dialog box will pop up with two choices -- switch to yahoo mail classic and cancel. If you're sure you want to switch, click the first option; otherwise, choose cancel to keep the new yahoo mail.

Depending on your computer's speed and your internet connection, the switch may take several seconds. When it's completed, you'll be looking at the old familiar yahoo mail classic interface.

How to change back to Yahoo--try this & see if it works for you
Log in to your yahoo mail account
In your web browser go to the yahoo mail home page sign in to your account using your yahoo ID and password, then click the yellow sign in button. Once you've successfully logged in you'll see your email folders on the left and the what's new and inbox tabs in the middle.
Choose the mail classic option
On the upper right side of the page there are three links -- Mobile, Options, and Help. Click Options, and when the drop down menu appears, choose mail classic
Confirm that you want to switch back
A dialog box will pop up with two choices -- switch to yahoo mail classic and cancel. If you're sure you want to switch, click the first option; otherwise, choose cancel to keep the new yahoo mail.

Depending on your computer's speed and your internet connection, the switch may take several seconds. When it's completed, you'll be looking at the old familiar yahoo mail classic interface.

As of May 2011, there are three versions of the free Yahoo! Mail available: a "classic" version, a standard version and a beta release of the latest Yahoo! Mail. While the company promises that the newest version is faster and better than its predecessors, some people may still prefer to switch back to more familiar territory after giving the new one a trial run. You can switch back and forth between the beta version and the one you currently use during the beta phase of the latest Yahoo! Mail.

Switching from Yahoo! Mail Beta
1.Log in to Yahoo! Mail Beta.
2.Click "Help" on the top left of the page.
3.Click "Return to Original Mail." A message will appear asking for your feedback on why you are switching back to the old Yahoo! Mail interface. Check the situation that applies to you and enter additional comments in the form. Leave it all blank if you do not want to give a reason.
4.Deselect "It's OK to contact me about my feedback" if you do not want Yahoo! to get in touch with you regarding your feedback. Otherwise keep it checked.
5.Click "Continue." You will be taken to the last version of Yahoo! Mail that you used before trying out the new beta.

Switching from Yahoo! Mail to Yahoo! Mail Classic

1.Log in to Yahoo! Mail.
2.Click "Options" on the right between "Mobile" and 'Help."
3.Click "Mail Classic..." A message will appear saying, "You're about to switch to Yahoo! Mail Classic. Before you do, we'd love your feedback."
4.Click the "feedback" link if you want to explain why you are switching to the classic version and fill in the form. Other
5.Click "Switch to Yahoo! Mail Classic."

Yahoo! has recently made over its email client, Yahoo! Mail. The old standard Yahoo! Mail Classic look has been replaced with New Yahoo! Mail, which offers most of the same features but looks different and is organized differently. Yahoo! Mail users who don't like New Yahoo! Mail, or who simply like Yahoo! Mail Classic better, can switch back to the classic view easily.
Step 1. Log in to your Yahoo! Mail account
In your web browser, go to the Yahoo! Mail home page (http://mail.yahoo.com). Sign in to your account using your Yahoo! ID and password, then click the yellow Sign In button. Once you've successfully logged in, you'll see your email folders on the left and the What's New and Inbox tabs in the middle.
Step 2. Choose the Mail Classic option
On the upper right side of the page, there are three links -- Mobile, Options, and Help. Click Options, and when the drop down menu appears, choose "Mail Classic..."
Step 3.Confirm that you want to switch back
A dialog box will pop up with two choices -- Switch to Yahoo! Mail Classic and Cancel. If you're sure you want to switch, click the first option; otherwise, choose Cancel to keep the New Yahoo! Mail. (If you wish to provide feedback about Yahoo! Mail, you can click the feedback link in the dialog box, which will open up a new window.)
Depending on your computer's speed and your Internet connection, the switch may take several seconds. When it's completed, you'll be looking at the old familiar Yahoo! Mail Classic interface.
I hope you're satisfy with my answer.
Have a good day! : )

Yahoo! has recently made over its email client, Yahoo! Mail. The old standard Yahoo! Mail Classic look has been replaced with New Yahoo! Mail, which offers most of the same features but looks different and is organized differently. Yahoo! Mail users who don't like New Yahoo! Mail, or who simply like Yahoo! Mail Classic better, can switch back to the classic view easily.
Step 1. Log in to your Yahoo! Mail account
In your web browser, go to the Yahoo! Mail home page (http://mail.yahoo.com). Sign in to your account using your Yahoo! ID and password, then click the yellow Sign In button. Once you've successfully logged in, you'll see your email folders on the left and the What's New and Inbox tabs in the middle.
Step 2. Choose the Mail Classic option
On the upper right side of the page, there are three links -- Mobile, Options, and Help. Click Options, and when the drop down menu appears, choose "Mail Classic..."
Step 3.Confirm that you want to switch back
A dialog box will pop up with two choices -- Switch to Yahoo! Mail Classic and Cancel. If you're sure you want to switch, click the first option; otherwise, choose Cancel to keep the New Yahoo! Mail. (If you wish to provide feedback about Yahoo! Mail, you can click the feedback link in the dialog box, which will open up a new window.)
Depending on your computer's speed and your Internet connection, the switch may take several seconds. When it's completed, you'll be looking at the old familiar Yahoo! Mail Classic interface.

I hope you're satisfy with my answer.

Have a good day! : )

Yahoo! has recently made over its email client, Yahoo! Mail.  The old standard Yahoo! Mail Classic look has been replaced with New Yahoo! Mail, which offers most of the same features but looks different and is organized differently.  Yahoo! Mail users who don't like New Yahoo! Mail, or who simply like Yahoo! Mail Classic better, can switch back to the classic view easily.

Step 1. Log in to your Yahoo! Mail account
In your web browser, go to the Yahoo! Mail home page (http://mail.yahoo.com).  Sign in to your account using your Yahoo! ID and password, then click the yellow Sign In button.  Once you've successfully logged in, you'll see your email folders on the left and the What's New and Inbox tabs in the middle.

Step 2. Choose the Mail Classic option
On the upper right side of the page, there are three links -- Mobile, Options, and Help.  Click Options, and when the drop down menu appears, choose "Mail Classic..."

Step 3.Confirm that you want to switch back
A dialog box will pop up with two choices -- Switch to Yahoo! Mail Classic and Cancel.  If you're sure you want to switch, click the first option; otherwise, choose Cancel to keep the New Yahoo! Mail.  (If you wish to provide feedback about Yahoo! Mail, you can click the feedback link in the dialog box, which will open up a new window.)

Depending on your computer's speed and your Internet connection, the switch may take several seconds.  When it's completed, you'll be looking at the old familiar Yahoo! Mail Classic interface.

I hope you're satisfy with my answer.

Have a good day! : )

Log in to your Yahoo! Mail account In your web browser, go to the Yahoo! Mail home page (http://mail.yahoo.com). Sign in to your account using your Yahoo! ID and password, then click the yellow Sign In button. Once you've successfully logged in, you'll see your email folders on the left and the What's New and Inbox tabs in the middle.

Step 2 Choose the Mail Classic option On the upper right side of the page, there are three links -- Mobile, Options, and Help. Click Options, and when the drop down menu appears, choose "Mail Classic..."

Step 3 Confirm that you want to switch back A dialog box will pop up with two choices -- Switch to Yahoo! Mail Classic and Cancel. If you're sure you want to switch, click the first option; otherwise, choose Cancel to keep the New Yahoo! Mail. (If you wish to provide feedback about Yahoo! Mail, you can click the feedback link in the dialog box, which will open up a new window.)
Depending on your computer's speed and your Internet connection, the switch may take several seconds. When it's completed, you'll be looking at the old familiar Yahoo! Mail Classic interface.

If you want to set back your Yahoo email to its old look after clicking the update , you can follow these procedure"

1 Log in to Yahoo! Mail.

2 Click "Options" on the right between "Mobile" and 'Help."

3 Click "Mail Classic..." A message will appear saying, "You're about to switch to Yahoo! Mail Classic. Before you do, we'd love your feedback."

4 Click the "feedback" link if you want to explain why you are switching to the classic version and fill in the form. Other

5 Click "Switch to Yahoo! Mail Classic."

you're in yahoo all new mail? click options it's on the upper right side beside mobile and help then click mail classic. it will revert you back to yahoo mail classic :)

Three ways of doing it...

1. Go to www.yahoomail.com (At the top right corner of the browser / window)
2. Look for Options. (Once you have click on it, drop down list will appear)
3. Look for Mail Classic

There you go! :)