If end users want access to Office 365 and Exchange from anywhere, Azure Multi-Factor Authentication service is the answer.
Consumers and businesses are more aware than ever of the dangers of unauthorized access to data stored in cloud services and on-premises IT systems. With on-premises systems, an easy way to ensure no one outside the organization can access data is to not publish it to the Internet. However, cloud-based services such as Office 365 are accessible from the Internet, and some of the key benefits include allowing access from anywhere. Those factors make it more difficult to guarantee security.