Microsoft 365 Copilot (formerly known as Microsoft 365 until January 2025) is a product family of productivity software, collaboration and cloud-based services owned by Microsoft. It encompasses online services such as Outlook.com, OneDrive, Microsoft Teams, programs formerly marketed under the name Microsoft Office (including applications such as Word, Excel, PowerPoint, and Outlook on Microsoft Windows, macOS, mobile devices, and on the web), and enterprise products and services associated with these products such as Exchange Server, SharePoint, and Viva Engage. Microsoft 365 also covers subscription plans encompassing these products, including those that include subscription-based licenses to desktop and mobile software, and hosted email and intranet services.
The branding Office 365 was introduced in 2010 to refer to a subscription-based software as a service platform for the corporate market, including hosted services such as Exchange, SharePoint, and Lync Server, and Office on the web. Some plans also included licenses for the Microsoft Office 2010 software. Upon the release of Office 2013, Microsoft began to promote the service as the primary distribution model for the Microsoft Office suite, adding consumer-focused plans integrating with services such as OneDrive and Skype, and emphasizing ongoing feature updates (as opposed to non-subscription licenses, where new versions require purchase of a new license, and do not receive feature updates).
In July 2017, Microsoft introduced a second brand of subscription services for the enterprise market known as Microsoft 365, combining Office 365 with Windows 10 Enterprise volume licenses and other cloud-based security and device management products. On April 21, 2020, Office 365 was rebranded as Microsoft 365, to emphasize the service's current inclusion of products and services beyond the core Microsoft Office software family (including cloud-based productivity tools and artificial intelligence features). Most products that were called Office 365 were renamed as Microsoft 365 on the same day. In October 2022, Microsoft announced that it would discontinue the "Microsoft Office" brand by January 2023, with most of its products and online productivity services being marketed primarily under the "Microsoft 365" brand. It continues to reside on the domain name office365.com, whereas personal (non-education/enterprise) accounts are on live.com. However, Microsoft reversed this stance with the release of an Office 2024 preview build in November 2023.

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