Note: To use this feature, you must be granted FULL ACCESS to the mailbox that you wish to open. Full access can be granted only on Enterprise accounts. Read the following Knowledge Base articles for more information:How do I enable Send As or Full Access permissions on Exchange 2007/2010? How do I share (let others see) my Outlook folders?
To open another user’s mailbox in Outlook Web Access:
If the mailbox doesn’t open and you get the following error message instead:"You do not have permission to open this mailbox. Contact technical support for your organization for access or for more information."then you need to make sure that you were granted full access to that mailbox.
Please double-check the permissions granted by going to HostPilot > MS Exchange Server 2010 > Exchange Mailboxes. Click the display name of the shared mailbox to open settings. On the Exchange Server tab, click Full access & Send As to view the list of permissions.
In case you need to open mailbox in Outlook client after full access is given please read the Knowledge Base article on How Do I Add Someone Else's Mailbox To My Exchange Outlook Profile?
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