Changing back to the original mail icon
Recently, I set Microsoft Outlook as the default mailer. Then, I changed back to Mail as the default mailer. But the icons of mail files stay the same, i.e. the icon of outlook, not the icon of mail. Do you know how to change the icons of the mail files back to the original one?
MacBook (13-inch Late 2009), OS X Yosemite (10.10.2)