Office 365 is a cloud-based subscription service that provides the latest versions of Microsoft Office applications and services like shared calendars, online meetings, email and file storage. It offers flexible subscription plans and ensures security, privacy and compliance with industry standards through physical and network security measures as well as monitoring and limiting access to customer data. Key features and benefits of Office 365 include always having the latest Office apps, collaboration tools, mobile access and manageability through a single administrative interface.