Explanation/Reference:
* A hybrid deployment offers organizations the ability to extend the feature-rich experience and administrative control they have with their existing on-premises Microsoft Exchange organization to the cloud. A hybrid deployment provides the seamless look and feel of a single Exchange organization between an on-premises Exchange Server 2013 organization and Exchange Online in Microsoft Office
365.
* Hybrid deployments can be configured for on-premises Exchange 2007-based organizations or later.
* Office 365 Business Premium do support a Hybrid deployment.
Hybrid deployments are supported in all Office 365 plans that support Windows Azure Active Directory synchronization. All Office 365 Enterprise, Government, Academic and Midsize plans support hybrid deployments. Office 365 Small Business and Home plans don't support hybrid deployments.
Reference: Hybrid deployment prerequisites
https://technet.microsoft.com/en-us/library/hh534377%28v=exchg.150%29.aspx#verify