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Symptoms

Assume that you try to configure a Microsoft Office 365 and Microsoft Exchange Server 2010 hybrid environment for Outlook Live users in a Microsoft Exchange Server 2010 environment. To do this, you use the Hybrid Configuration wizard. Additionally, the domain names of the Outlook Live users use the following format:

TenantDomainName.org
In this situation, you cannot configure the hybrid environment, and you receive the following error message:

The signup domain 'org' derived from 'TenantDomainName.org' is not a valid domain.


Cause

This issue occurs because the Hybrid Configuration wizard assumes that the domain names of the Outlook LiveĀ usersĀ use the following format:

TenantDomainName.onmicrosoft.com

Resolution

To resolve this issue, install the following update rollup:

2746164 Description of Update Rollup 6 for Exchange Server 2010 Service Pack 2

Status

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 Hybrid Configuration wizard, go to the following Microsoft website:

Understanding the Hybrid Configuration wizard

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