The search email box in my YAHOO is not working right. How do I fix this?

I'll search a name or email address that I definitely have in my inbox, and the search will come back with no results. Why is this happening and how do I fix it? HELP!! Thanks|||The search feature hasn't been working correctly for the past few months, for some it's sporadic. Yahoo said they are trying to get it fixed, but ran into problems while upgrading the servers.|||clicking the word 'to' should bring up your address book.