Hello.  Please help.  I now have my 2nd case of duplicate folders - Calendar, Tasks, Notes, Journal, RSS Feeds appearing in Outlook. Taking off cached mode doesnt help nor does Outlook /resetfolders, outlook /resetfoldernames or outlook/resetnavpane.

Giving myself permission to the mailbox and creating Outlook profile on my PC yields the same result.  Opening via OWA shows the same duplication.  MFCMapi, hard delete on the newer folder does not work. 

In 12 years as an Exchange Admin, from 5.5 all the way through to Exchange 2010 I have never seen this before.

And before you ask - no there are no Blackberrys/PDAs involved.  Any suggestions please?

Nicki

Hi,

Did you refer to the following article to delete the duplicate folder by MFCMAPI?

How to remove duplicate folders in Outlook when connected to an Exchange Server mailbox

http://support.microsoft.com/kb/2509983/en-us

Whats error when using the MFCMAPI to delete the duplicate folders?

The most efficient way is to backup and rebuild the mailbox.

Thanks,

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Thank you Simon for the reply. 

I successfully deleted the duplicate folders using MFCMapi the real question is what on earth is causing this level of duplication. I have seen the odd dup calendar before, but these two users had identical duplication and the creation date property on the new folders (of which calendar was the big concern) was within 48hrs one being the 3rd July the other the 5th July. Neither have BB or pda so if we're looking at 3rd party apps as a potential cause - then we have some quest tools running post migration and eas (aka zantas archiving). My biggest concern is whether the issue could spread and what could be the underlying cause?

Both users reported that they had accessed their email remotely whilst dialled in shortly prior to the Incident occurring.

P.S Sorry I should have explained the method I used to correct the problem.  It appeared the newer folders had become the new default delivery location so I had to copy all the messages from the older folders into the newer ones and then delete the older ones via MFCMapi.  I was not able to delete the newer folders successfully by the same method presumably because they had become the new default delivery locations.

Thank you

Hi Nicki,

Based on my experience, the issue is more related to the user behavior or client side software environment. Can you check whether there are a log third-party add-ins on the client or does the user sync with mailbox by other tools besides Outook?

Thanks,

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