Office 365 is a subscription-based online office and software plus services suite which offers access to various services and software built around the Microsoft Office platform;
Serving as a successor to Microsoft’s Business Productivity Online Suite, the service was originally designed to provide hosted e-mail, social networking and collaboration, and cloud storage to teams and businesses. As such, it first included hosted versions of Exchange, Lync, SharePoint, Office Web Apps, along with access to the Microsoft Office 2010 desktop applications on the Enterprise plan. With the release of Office 2013, Office 365 expanded to include new plans aimed at different types of businesses, along with new plans aimed at general consumers wanting to use the Office desktop software on a subscription basis.
Work from virtually anywhere using the Office applications you trust across your favorite devices—PCs, Macs, and select mobile devices. Keep everyone in sync with enterprise-grade email and shared calendars they can access at their desk or on the go. Collaborate with team mates, partners, and customers with documents that are always up to date and accessible from almost anywhere.

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The world’s leading productivity tools in a form that fits your business, today and tomorrow. A version of Microsoft Office delivered as a flexible service and supported by cloud-connected Office 365 services, Office Professional Plus is our most complete productivity experience. You get the latest versions of the familiar Office applications and the Office Web Apps, freeing your people to create, communicate, and work together efficiently from virtually any device.

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Exchange Online offers email, calendar and contacts designed to provide your business with the control you want and the security and reliability you need. With Exchange Online, you run your email on our globally-redundant servers, protected by built-in antivirus and anti-spam filters and unlimited, IT-level phone support 24 hours a day, seven days a week in your local language.

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Keep teams in sync. SharePoint Online gives you a central place to share documents and information with colleagues and customers. Designed to work with familiar Office applications, it’s easy to save documents directly to SharePoint, and work together on proposals and projects in real-time because you have access to the documents and information you need from virtually anywhere.

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Office Web Apps are convenient online companions to Microsoft Word, Microsoft Excel, Microsoft PowerPoint, and Microsoft OneNote that offer you an easy way to access, view, and edit documents directly from your web browser.