1. Open Command Prompt.
2. Type:
dsmod userUserDN-pwdNewPassword
3. If you want to require the user to change this password at the next logon process, Type:
dsmod userUserDN-mustchpwd {yes|no}
UserDN: Specifies the distinguished name of the user for which the password will be reset.
NewPassword: Specifies the password that will replace the current user password.
Examples:
To reset a user's password:
dsmod user "CN=John Doe,CN=Users,DC=microsoft,DC=com"
-pwd A1b2C3d4 -mustchpwd yes
To reset multiple user passwords to a common password
and force them to change their passwords the next time they logon:
dsmod user "CN=John Doe,CN=Users,DC=microsoft,DC=com"
"CN=Jane Doe,CN=Users,DC=microsoft,DC=com" -pwd A1b2C3d4 -mustchpwd yes
To disable multiple user accounts at the same time:
dsmod user "CN=John Doe,CN=Users,DC=microsoft,DC=com"
"CN=Jane Doe,CN=Users,DC=microsoft,DC=com" -disabled yes
ref: http://techtoy-blog.blogspot.hk/2010/06/reset-user-password-active-directory-ad.html
