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Open XML Formats and file name extensions - Microsoft Support
Microsoft Office uses the XML-based file formats, such as .docx, .xlsx, and .pptx. These formats and file name extensions apply to Microsoft Word, Microsoft Excel, and Microsoft PowerPoint.
View previous versions of Office files - Microsoft Support
View previous versions of a file. If your file is stored in OneDrive or SharePoint in Microsoft 365, you can go back to a previous version of file. This is incredibly important if a mistake was made, you have issues with malware or a virus, or you just prefer a previous version.
Improve accessibility with the Accessibility Checker
To check your content for accessibility issues, do one of the following depending on the app you're using: Microsoft 365 for the web apps except Outlook on the web. pane will open to the right of the screen. Choose an option to view , Tips, or …