Contacts don't show up

I am using a laptop running on windows XP home edition. I use OE to
send and receive email.
Recently, I find a problem when I try to create a new mail. When I
click the button "To", in the select receipt window, I select "Main
Identity's contacts", nobody show up. but I can find contacts when I
click the find button.

Any help is appreaciate.

.