Learn how to run a disk cleanup in Windows including deleting temporary and system files to free up disk space.

Use the XLOOKUP function when you need to find things in a table or a range by row. For example, look up the price of an automotive part by the part number, or find an employee name based on their employee ID. With XLOOKUP, you can look in one column for a search term, and return a result from the same row in another column, regardless of which side the return column is on.

Instead of fix-it tools, Windows 10 uses troubleshooters to help you solve problems with your PC. To run a troubleshooter: Select Start > Settings > Update & Security > Troubleshoot > Additional troubleshooters, or select the Find troubleshooters shortcut at the end of this topic, and then select Additional troubleshooters.

Tip: If you installed the Microsoft 365 apps as part of a suite, such as Office Home and Student or Microsoft 365, search for the suite name.For stand-alone apps search by the app name, such as Project or Visio. In most cases you can't uninstall an individual app if it's included in your Microsoft 365 suite.

At Microsoft, we're guided by our AI principles, our Responsible AI Standard, and decades of research on AI, grounding, and privacy-preserving machine learning.Data privacy and security is a key principle of responsible AI. We aim to help our customers use our AI products responsibly, sharing our learnings, and building trust-based partnerships.

The Dark Mode setting doesn’t carry over between Web, Windows, and Mac – you will need turn it on for each platform. If Word is not remembering your Dark Mode preferences, check your browser’s cookie settings. Cookies must be enabled for your preferences to persist.

Note: In earlier versions of Outlook, IMAP accounts also used an Outlook Data File (.pst).In Outlook 2016 and Outlook for Microsoft 365, IMAP accounts use Offline Outlook Data Files (.ost). You can also use an Outlook Data File (.pst) to backup or export items from any type of email account.

Troubleshooting: I don't see Automatic Replies. If you don't see Automatic Replies after selecting File, you're probably using a Gmail, Yahoo, or other POP or IMAP account that doesn't support the Outlook Automatic Replies feature. You can set up a rule that will reply to incoming messages—if you leave Outlook running while you're away.

If they don't match, manually change them. Additionally, compare the encryption types (next to Use the following type of encrypted connection) for both Incoming and Outgoing servers as well and, if they don't match, manually change them. Click OK, and then click Test Account Settings on the Change Account window.

Les problèmes matériels peuvent être dus à des pilotes obsolètes ou défectueux. Assurez-vous que votre pilote audio est à jour et, si nécessaire, mettez-le à jour. Si cela ne fonctionne pas, essayez de désinstaller le pilote audio (il sera automatiquement réinstallé).