Office 365 is Microsoft's next-generation cloud computing product, including Office SharePoint Online, Exchange Online and Lync Online components, and provides real-time upgrade services for these components. Office 365 is the only web-based service that is fully compatible with Microsoft Office. Office 365 was officially released on June 28, 2012. In short, Office 365 is complete Office software with cloud storage.

On February 16, 2014, Microsoft and eSignature application developer DocuSign reached a long-term strategic cooperation to integrate digital signature services into the Office 365 cloud office suite. The new Microsoft Outlook, Word, SharePoint Online and SharePoint Server 2013 with integrated eSignature functionality will be officially available through the Office Store starting in March 2014. In March 2014, Microsoft upgraded the Office 365 interface and functions to highlight the core position of social collaboration.