Article ID: 2685996 - View products that this article applies to.
Consider the following scenario:
The Mailbox you are trying to access isn't currently available. Please try again in a few minutes.
This issue occurs because Outlook Web App Premium cannot create a security context if the user does not have a mailbox. When Outlook Web App Premium uses an Exchange Server 2010 Client Access server to redirect the request to another server, Outlook Web App Premium requires a mailbox to create a security context. However, because the user does not have a mailbox, a UserHasNoMailboxException exception is thrown.
To resolve this issue, install the following update rollup:
(https://support.microsoft.com/kb/2661854/ )Description of Update Rollup 2 for Exchange Server 2010 Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about a similar issue, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/2489822/ )"The Mailbox you are trying to access isn't currently available" error when you use OWA Premium to try to delete an item that is in a shared mailbox
Article ID: 2685996 - Last Review: April 16, 2012 - Revision: 1.0