Learn how to get started with PowerPoint for the web from Office.com and create presentations online.

Apprenez à activer Windows à l'aide d'une clé de produit ou d'une licence numérique, à vérifier l'état de votre activation et à lier votre compte Microsoft.

Get security info and tips about threat prevention, detection, and troubleshooting. Including tech support scams, phishing, and malware.

In Excel, Outlook, PowerPoint, or Word, for Windows and Mac, you can format (add, change or remove) error bars in a chart.

Correct the #N/A errorin the VLOOKUP function. INDEX and MATCH offers more flexibility with matches. INDEX and MATCH can find an exact match, or a value that is greater or lesser than the lookup value.

Get started with news and interests, choose how weather looks on your taskbar, turn it on and off, personalize your feed and choose interests and followed publishers.

Learn what to do if Surface won’t turn on, turns on then off, or starts and gets stuck on a screen—a black screen, a screen with a logo, or another screen

How to correct a #SPILL error in Excel (when a formula returns multiple results and cannot return them to the grid).

Want to add a padlock to your email messages? You can use S/MIME in Outlook on the web to increase the security of messages. A digitally encrypted message can only be opened by recipients who have the correct key.

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