You can’t access an Exchange Server 2010 additional mailbox in OWA after a mailbox is moved to Exchange Server 2013 in Office 365 dedicated/ITAR

Symptoms
After a mailbox is moved to Microsoft Exchange Server 2013, you can’t use the Open Additional Mailbox option in Outlook Web App (OWA) if the mailbox is using ANSI mode in Exchange Server 2010.
Cause
This issue occurs because Windows Integrated Authentication (WIA) is required for redirection between Exchange Server 2010 and Exchange Server 2013 Exchange sites. WIA is disabled by design in Exchange Server 2010 and Exchange Server 2013 ANSI mode for improved security.
Resolution
To fix this issue, access the ANSI mode Exchange Server 2010 mailbox by using the explicit OWA URL (for example, https://mail.contoso.com/owa/sharedmbx@contoso.com).
Properties

Article ID: 3117471 - Last Review: 11/16/2015 18:29:00 - Revision: 1.0

Microsoft Business Productivity Online Dedicated, Microsoft Business Productivity Online Suite Federal

  • vkbportal226 KB3117471
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