Azure Active Directory is a comprehensive identity and access management cloud solution that provides a robust set of capabilities to manage users and groups and help secure access to applications including Microsoft online services like Office 365 and a world of non-Microsoft SaaS applications.
The Windows Azure Platform enables businesses to run critical applications with a higher performance-price ratio by running them on the services platforms data centers on a pay-as-you-go basis.
Microsoft Office is a suite of desktop productivity applications and client and server software designed for data analysis, presentations and numeric manipulations.