Reset User Account Password Dialog Box
Use the Reset User Account Password dialog box to assign a new password to a user account.
You should reset the password for a user account only if the user has forgotten the password. When you reset the password, the user will lose access to all EFS-encrypted files, personal certificates, and stored passwords for Web sites and network resources.
Your password choice should follow Windows Server 2008 recommendations for creating a strong password. A strong password has a length of at least eight characters and contains a combination of uppercase characters, lowercase characters, numerals, and special characters.