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Sign-in format for Outlook Web App on mobile devices is not adjusted according to the Set-OwaVirtualDerictory cmdlet in an Exchange Server 2013 environment

Assume that you configure a full domain sign-in format (Domain\user) for Outlook Web App by running the Set-OwaVirtualDirectory cmdlet in Exchange Management Shell (EMS) in a Microsoft Exchange Server 2013 environment. When you try to log on to Outlook Web App by using a mobile device, such as an Apple iOS device or Windows Phone 8, the logon page of Outlook Web App prompts you to enter your email address instead of entering credentials in the "Domain\user" format.
This issue occurs because Outlook Web App labels are hardcoded for mobile devices. Therefore, the customized sign-in format does not work.
To resolve this issue, install the following cumulative update: 
2892464 Description of Cumulative Update 3 for Exchange Server 2013

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
For more information about the Set-OwaVirtualDirectory cmdlet, go to the following Microsoft website:For more information about how to configure a full domain sign-in format for Outlook Web App, go to the following Microsoft website:Third-party information disclaimer

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

Article ID: 2889786 - Last Review: 11/25/2013 17:37:00 - Revision: 2.0

Microsoft Exchange Server 2013 Enterprise, Microsoft Exchange Server 2013 Standard

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