Why can’t I edit this file? - Microsoft Support
网页If a worksheet or presentation is locked for editing and can’t be edited in the Windows desktop application, it may be that the file is already being edited by someone else, or they have the file checked out. Not sure what "checked out" means? This article might help: Check out or check in files in a document library.
XML for the uninitiated - Microsoft Support
网页Learn the basics of XML, a language for marking up data with tags that define its structure and meaning. Find out how XML can be used to exchange data among programs and systems, and how schemas and transforms enhance its functionality.
Save a copy before editing to prevent changing the original file
网页Learn how to use Save a Copy feature in Microsoft 365 to create a new document from an existing file without overwriting the original. See how to restore a previous version of a file with Version History if you make unwanted changes.
Manage your Microsoft 365 subscription or Office product - Microsoft …
网页Learn how to install, renew, cancel, or share your Microsoft 365 or Office product with your Microsoft account. Find your product version and select Services & subscriptions to manage your account.
Activate Office - Microsoft Support
网页Learn how to activate Microsoft 365 or a non-subscription version of Office on your device. Find troubleshooting tips for common activation errors and product keys.
Trim a video, music clip, or sound clip in PowerPoint
网页Learn how to remove unwanted content from a video or audio clip that you've added to a PowerPoint slide. Follow the steps to select, trim, and save a copy of a trimmed media file.
My Print button and some printer settings aren’t available
网页If there is a problem with the printer or printer driver, the connection to the printer might have been disabled, or some printer settings might have been hidden. You can try the following common solutions to fix the problem. Run Microsoft Update. For more information, see Update Office and your computer with Microsoft Update.
Check spelling in your presentation - Microsoft Support
网页Fix spelling as you work. Right-click on a word with a red squiggly line underneath. Select the correct spelling from the list of suggestions. Or you can choose: Ignore All: Ignores the error and removes the red squiggly line. Add to Dictionary: Adds the spelling to the dictionary so that spelling will not show an error in the future.