I have a yahoo account and I would like to back up all the mail from that account to a gmail account. So, is there a way I can get Zimbra Desktop to synchronize my gmail account with yahoo account, automatically ?

As of now, I'm using Import/Export feature to copy mail from yahoo account to gmail account and it is quite a tedious thing to do. Hence, I was wondering if there is a way to automatically sync gmail account with yahoo account ?

Thanks for any help.