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I have 43 folders, but, I can see only 7. Where are my folders?
Ask in the forum for Opera on your operating system.
Still in mourning for Opera 12.........
"Menu -> mail -> IMAP folders". Make sure you're subscribed to them. Also, check at mail.yahoo.com in the settings to see if there's anything hiding them from IMAP if you don't see them in the IMAP folders list in Opera Mail.