Duplicate folder structure in Outlook

Blue Street Tech
Blue Street Tech used Ask the Experts™
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Historical overview: I have been running 14 mail accounts distributed over 4 mailboxes (1 Exchange, 3 POP) perfectly since Outlook 2010 was released. One day I see duplicated items for the Exchange mailbox only in the To Do Bar [ATTACHED as Fig 1] and Reminders Window. At the time, I suspect its maybe WUS update causing it. Windows had recently released 16 patches for Win7. I went through one-by-one removing the patches, and then rebooting to see if it corrected the issue. It did not. Then I re-applied then all and removed the profile entirely, all the email accounts and all mailboxes to isolate the issue. I only created the Exchange profile and during the initial sync the mail structure duplicates with different icons on the second structure [SEE ATTACHED as Fig 2]. After Outlook is closed and re-opened, it resolves back to normal, however, then Reminders and the TO DO list duplicates. The actual items in the inbox do not. I have a rule setup to flag all messages.

I have performed the following steps:
- Recreated the mail profile 5x’s by deleted the mail profile and the OST file, rebooting & starting from scratch.
- Removed cache mode.
- outlook.exe /cleanreminders
- outlook.exe /resettodobar
- outlook.exe /safe:3
- I have already opened a case w/the SaaS exchange provider

all failed to remedy.

There is no /cleanprofile switch for Outlook 2010 anymore so I do not know what has replaced it.

Environment: Windows 7 Pro (fully patched), workgroup, Outlook 2010 (fully patched), Cloud Exchange Enterprise 2010 (fully patched).
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Do you have a blackberry setup with Enterprise Activation?
Take a look at this and see if it helps at all: http://www.anti-dupe.com/products/prevent_outlook_duplicate.aspx

Blue Street TechLast Knight
Distinguished Expert 2018

Author

Commented:
@BCipollone: Thanks for your response! BB is available for us to use but we have do not thus far…only ActiveSync. I would assume because we can “enable it” and use it in less than 2 minutes that the server is running in the bg and is just waiting for activation. I will have to confirm w/the SaaS provider.
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Commented:
Try disabling activesync on one of the mailboxes.

Also, If you are using the same mail profile name when recreating might be worth trying a new name.
Blue Street TechLast Knight
Distinguished Expert 2018

Author

Commented:
That article does not apply to my situation unfortunately.
Blue Street TechLast Knight
Distinguished Expert 2018

Author

Commented:
@ConUladh: Thanks but i figured out the issue.
Last Knight
Distinguished Expert 2018
Commented:
I found the issue! You won’t believe it. lol

Exchange 2010 sp1 introduced auto-mapping of other mailboxes. For some reason, the mailbox in question was set as a delegate to itself, and thus it opened up both mailboxes in Outlook.

The only way to fix it however is to remove the attribute in AD for each user and/or the whole account.

Auto Mapping Mailboxes with Full Access (Shared) In Outlook 2010 Using Exchange 2010 SP1…
http://www.howexchangeworks.com/2010/09/auto-mapping-mailboxes-with-full-access.html
Blue Street TechLast Knight
Distinguished Expert 2018

Author

Commented:
I found the issue.

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