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run get-mailboxpermission -identity 'mailbox' and make sure he has the appropriate perms.
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run get-mailboxpermission -identity 'mailbox' and make sure he has the appropriate perms.

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User has full mailbox permissions
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shared mailbox on same server?
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This is by design. &nbsp;If an email is marked private, then it doesn't show in a shared mailbox.<br />
It is possible to create a transport rule to change the sensitivity of emails sent to shared mailboxes to normal if private.<br />
<br />
Set &quot;Sensitivity&quot; with &quot;Normal&quot;
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This is by design.  If an email is marked private, then it doesn't show in a shared mailbox.
It is possible to create a transport rule to change the sensitivity of emails sent to shared mailboxes to normal if private.

Set "Sensitivity" with "Normal"

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<div class="content wysiwyg-content">
Since moving a users personal mailbox to a new database they are unable to open a group mailbox to which they have permission.
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Since moving a users personal mailbox to a new database they are unable to open a group mailbox to which they have permission.

Exchange 2010 shared mailbox access issue

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.