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I have a strange problem with Mail and I cannot understand if it's a bug or not.

When I archive a message, Mail creates duplicated subfolders. They are called "On my Mac" and they are located under "Archive" folder.

All the subfolders, 4 in my case, contain the same message. This is quit strange since if I delete a folder, I cannot find the message anywhere else (i.e. the message is deleted in the other ones).

Here a discussion on Apple forum where it appears to be an unresolved bug: Duplicate Mail archive folders.

I'm running ML 10.8.4 and Mail 6.5.

Any suggestions?

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Is the duplicate folder still there when you go off line with mail? – Buscar웃 Aug 14 '13 at 18:49
@Buscar웃 Sorry for the delay. Yes. Non chance to remove that additional folders. Thank you. – Lorenzo Boaro Aug 16 '13 at 11:27

I've had this problem for quite some time. I did a completely new install on a brand new machine and still had this problem. Here was my solution.

Back before Mail had an archiving feature, I had a folder called "Archive" that I used to put mail that matched certain rules. The presence of this rule caused a folder to be created with that name. This must have cause some electronic version of confusion.

When I removed the rule and deleted the folder one more time, I was left with a single Archive folder.

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