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Introduced in 2017, Microsoft 365 is a comprehensive suite of productivity and collaboration tools that combines the traditional Microsoft Office applications with cloud-based services like OneDrive and Microsoft Teams, aimed at enhancing workplace communication, collaboration, and productivity. It marks a strategic shift towards an integrated platform offering not just office applications but also advanced security, compliance, and device management capabilities to support a diverse and mobile workforce. This subscription-based model ensures users always have access to the latest software versions and innovations from Microsoft.

Microsoft 365 is a “complete, intelligent solution, including Office 365, Windows 11, and Enterprise Mobility + Security, that empowers everyone to be creative and work together, securely.”

Snippet from Wikipedia: Microsoft 365

Microsoft 365 Copilot (previously Microsoft 365 until January 2025 and Office 365 until April 2020) 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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