Thanks the both of you, I tried the QRESYNC thing, but that didn't fix it. After deleting the account as well as the whole folder in C:\Users***\AppData\Local\Opera Mail and setting everything up again, the missing mails turned up again. So I suppose the problem will not turn up again

Hi,

I encountered a strange problem with Opera Mail 1.0 .. I noticed, that some mails are not showing up in my inbox when checking mails with Opera Mail, but they show up when checking with my mobile phone or via web access.

I'm accessing mails via IMAP on all devices and have over 12000 mails stored in my inbox. Junk mail folder is empty, so the missing mail are not flagged as spam or something. When I delete one of these "invisible" mails via smartphone they appear in the trash folder on all clients including Opera Mail. Occasionally I get old messages from my inbox marked as unread, too. I guess the two effects have the same cause.

Anyone with an idea how to fix this?

Thank!