- You are in a Microsoft Exchange Server 2013 environment.
- You have multiple domains (parent domains and child domains), and some domains are not prepared for Exchange Server 2013.
- You are assigned the Full Access and Send As permissions to a shared mailbox through a security group in Outlook with auto-mapping disabled.
Cannot expand the folder. The set of folders cannot be opened. Microsoft exchange is not available. Either there are network problems or the exchange computer is down for maintenance.