Gmail seems to work fine, but when I try to go on to Yahoo, to access my email, my inbox says there is none. I know that there are emails, since on Outlook it displays that there are 30 unread messages. 

I'm not sure if this is a problem with the syncing of Yahoo and Outlook, or something else. I can't access my Yahoo account with any other computer but the computer that I use at work. 

This problem is making my life very inefficient. Please help me out.