If you’re a Windows Server 2012 R2 user and you use the Essentials Experience role (same features as the standalone SKU) in a multi domain controller (DC) environment, you may have noticed that the wizards for integrating with Office 365 and Windows Azure Active Directory are disabled. This is because they were designed to function in a single DC environment.
Today, Microsoft has corrected this behavior as part of update rollup 2975719. If you install this update rollup, you should now be able to use the wizards as intended.
More info: Update Rollup August 2014 | Office 365 Integration KB