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This seems to be related to Opera's e-mail client, not the Opera Web Mail service. Such things should be posted in the mail forum further down on the main forum list.
I would also recommend that you specify which e-mail provider you are using, as that could be relevant. For example, I believe there are some problems with Gmail's IMAP implementation which could cause duplicates to appear. You should also try to think of things you did just before this started happening (such as upgrading Opera).
This seems to be related to Opera's e-mail client, not the Opera Web Mail service. Such things should be posted in the mail forum further down on the main forum list.
I would also recommend that you specify which e-mail provider you are using, as that could be relevant. For example, I believe there are some problems with Gmail's IMAP implementation which could cause duplicates to appear. You should also try to think of things you did just before this started happening (such as upgrading Opera).
The Opera Ninja recommends a forum search to find answers to your questions 
Håvard Kvam Moen @ My Opera / Twitter

Håvard Kvam Moen @ My Opera / Twitter
thank you for your quick answer
I just installed windows 7 and the last version of Opera, before I was also using Opera 10.51 on windows XP but everything was fine
you're right I use Gmail as email provider, if that's the only solution i'll switch it to POP3
I didn't know Opera provided email hosting services, i'll give it a try
sorry I posted in wrong section
I just installed windows 7 and the last version of Opera, before I was also using Opera 10.51 on windows XP but everything was fine
you're right I use Gmail as email provider, if that's the only solution i'll switch it to POP3
I didn't know Opera provided email hosting services, i'll give it a try

sorry I posted in wrong section
So it's Gmail again... 
If you are interested in more details, here's an old-ish blog post about the problem:
http://weblog.timaltman.com/archive/2008/02/24/gmails-buggy-imap-implementation

If you are interested in more details, here's an old-ish blog post about the problem:
http://weblog.timaltman.com/archive/2008/02/24/gmails-buggy-imap-implementation
The Opera Ninja recommends a forum search to find answers to your questions 
Håvard Kvam Moen @ My Opera / Twitter

Håvard Kvam Moen @ My Opera / Twitter
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