Outlook 2010 shared mailbox marked as read/unread issue

Hi Outlook Pro's,
We've got a weird issue on a shared e-mail account in exchange. 2 users accessing the shared account currently experience this issue whereas another one works fine and we're trying to determine the source of the problem.
When browsing the shared e-mail account's inbox, and opening an e-mail, the e-mail isn't marked as read in the inbox. This is a problem as other users viewing the same e-mail account can't see whether the e-mail is being serviced.
However, if we categorize the e-mail, it is marked as read/unread instantly. Or if we switch to the users personal inbox and back again it changes the read/unread status.
User services has tried the following:-
1. Changed Reading Pane options for when the mail item is marked as read.
2. Enabled the reading pane addon for Outlook.
3. Repairing the OST (clearing the exchange cache)
3. Switching the effected user to another computer, it's almost like the problem follows their profile.
The e-mail account is shared between 5 users, only 2 of which are experiencing this problem.
Is there anything else we can try on the user end?
What should we investigate in Exchange?

Analysed first according to your description.
1. Changed Reading Pane options for when the mail item is marked as read. - no option problem
2. Enabled the reading pane addon for Outlook. - What's add-ins in your site?
3. Repairing the OST (clearing the exchange cache) - Not the problem for data file itself
4. Switching the effected user to another computer, it's almost like the problem follows their profile. - Not the problem related the shared mailbox
5. The e-mail account is shared between 5 users, only 2 of which are experiencing this problem - conflict with the result of Point 4, it looks the local profile still be the doubt..
At this point, please try to run Outlook.exe with safe mode on those two problematic computers and avoid any add-ins interrupt. You may also use the switch command-line /cleanviews to check the result as well.
On other hand, please double confirm if the problematic computers' connection status vs. none-issue machines'. Using the cable connection with the same network speed? RPC/MAPI or RPC over http? etc... Any difference might be the cause.
Tony Chen
TechNet Community Support

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Outlook 2010 Shared Mailbox Outbox Send Immediately Issue

Hello,
So we have a weird problem tat we have being trying to diagnose for a while and I think that I have finally got to the bottom of the problem, just now need to find a solution.
We have a shared email email account. This is set up as shared mailbox in exchange (2010) with Full Control and Send On behalf of privileges given to three users. Each of these users has added this shared mailbox
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Based on the description above, the issue is that when you send an email message from a shared mailbox, the sent email message remains in your Outbox until you manually perform a Send/Receive operation.
As far as I know, this problem occurs when both the following conditions are true:
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1.
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registry value to zero (0). Additionally, if your mailbox is located on Microsoft Exchange Server 2010 (or later), the Exchange administrator can configure similar behavior on the server.
Important
Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it,
back up the registry for restoration in
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To change the value of DelegateSentItemsStyle to 0 in the registry, follow these steps:
Exit Outlook.
Start Registry Editor.
In Windows 8 and Windows 8.1
Swipe in from the right to open the charms, tap or click Search, and then type
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regedit in the search results.
In Windows Vista and Windows 7
Click Start, type regedit in the Start Search box, and then press Enter. If you are prompted for an administrator password or for confirmation, type the password, or click
Allow.
In Windows XP
Click Start, click Run, type regedit, and then click
OK.
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HKEY_CURRENT_USER\Software\Microsoft\Office\<var>x</var>.0\Outlook\Preferences
Note In this key path, the placeholder <var>x</var>.0represents
15.0 for Outlook 2013, 14.0 for Outlook 2010,
12.0 for Outlook 2007, and 11.0 for Outlook 2003.
Select the DelegateSentItemsStyle value.
On the Edit menu, click Modify.
Type 0, and then click OK.
Exit Registry Editor.
Start Outlook.
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Email remains in the Outbox when you use the DelegateSentItemsStyle registry value
Regards,
Melon Chen
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs. Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
[email protected].

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Welcome to the BlackBerry Support Community.
Is your email account integrated as POP on your BlackBerry® Curve™ 8520 smartphone? If it is, this KB article should provide some ways to resolve this issue. "Email messages on a Microsoft Exchange Server are marked as read when accessed via POP" http://bbry.lv/KvCTaM
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-FS
Come follow your BlackBerry Technical Team on Twitter! @BlackBerryHelp
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Outlook 2010 shared mailbox marked as read/unread issue

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