Symptoms
Consider the following scenario:
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You're working in an Office 365 hybrid environment.
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You have a mailbox that is hosted on an on-premises server that is running Microsoft Exchange Server 2010.
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An Exchange Online user adds the mailbox to an Outlook profile as an additional mailbox.
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The Outlook Anywhere (RPC/HTTP) connection of the on-premises mailbox to the Outlook client is disabled.
In this scenario, some users cannot expand the folders of the on-premises mailbox, and they can see only free/busy data in the Outlook calendar even though they have Full Access or Editor/Reviewer permissions to this mailbox.
Resolution
To fix this issue, add the on-premises mailbox as an additional account in the Outlook client. To do this, follow these steps:
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Select File > Info > Account Settings.
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On the E-mail tab, select New.
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On the Auto Account Setup page, enter the mailbox name, the email address, and your account password.
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Select Next.
Note Make sure that you have Full Access permission to this mailbox.
