Office 365 includes Microsoft's Server products-
Microsoft Exchange Online is an email and personal information management service. Exchange ActiveSync provides mobile connectivity to Exchange services and mobile email applications. Microsoft SharePoint Online is a collaboration, sharing, and document editing service using internal and external sites. It can also be used to create public-facing Web sites. Microsoft Lync Online provides communications features including presence information, instant messaging, PC-to-PC audio/video calling and online meetings that can include PC audio, video and web conferencing with application sharing, whiteboards, and other collaboration tools. Office Web Apps are browser-based versions of Microsoft Excel, Word, and PowerPoint that enable viewing and lightweight editing of Office documents in Web browsers while preserving the formatting of the original documents.