How do I add my Yahoo mail into Outlook 2013 and keep the account synced?

How do I add my Yahoo mail into Outlook 2013?
Follow the following link, use imap instead of POP3 since POP is not enabled in Yahoo.com:

http://superuser.com/questions/595827/how-to-add-yahoo-mail-account-to-outlook-2013/656253#656253

Then how do I keep the account synced?
Following the instructions in the following link to download the sync.msi utility and install it.

http://www.wikihow.com/Synchronize-Outlook-Data-with-Yahoo

Then it works!! Beautiful.