Employee collaboration and access to communication tools are essential for workplace productivity. Organizations are increasing their use of Microsoft Office 365, a subscription-based service that provides hosted versions of familiar Microsoft applications. Most businesses choose Exchange Online as the first app in Office 365 they adopt.
The challenge with any SaaS application such as Office 365 is that user authentication is usually handled by the application itself, so user credentials are typically stored and managed in the cloud by the provider. The challenge for IT is to properly authenticate the employee (whether located inside or outside the corporate network) to a highly available identity provider (such as Active Directory).