Microsoft released a white paper how to deploy Microsoft Exchange: as Exchange Server 2010 on-premises, Exchange Online with Microsoft Office 365 in the cloud, or using both in a temporary or permanent hybrid scenario.
Knowing the benefits and limitations of each deployment option can help you make the right decision for your organization. Whatever you decide, the deployment flexibility that Microsoft provides with Exchange makes it easier for you to get the right solution for your business.
Download HERE the whitepaper