Now I changed my mine to sync every gmail labels.

What could cause Opera mail 1.0 won't check-mark my imap folder ?

I manually checked-mark all folders & I also checked-mark in mail.google.com the same.

Opera Mail does not remember the check-marks & I come back check later all check-box are not checked.

Thank you very much.
Edmond.

Or, goto "Menu -> mail -> IMAP folders" and unsubscribe from the folders you want and Opera will unsync them. Be careful though, some older versions of Opera Mail had a bug where that would delete all messages on the server in that folder. I don't remember what versions, so you'll had to create a folder, put a couple of unimportant messages in it, unsubscribe from that folder and see if they're wiped out from mail.google.com or not. If not, then it should be okay to do this in your version of Opera. But, best to have the messages backed up also.