Find your product key to activate Windows. A product key is a 25-character code that's used to activate Windows and helps verify that Windows hasn't been used on more PCs than the Microsoft Software License Terms allow.

Learn more about keyboard shortcuts for accessibility in Windows, including shortcuts for Narrator, Magnifier, and more.

Tip: For Microsoft 365, Exchange, Exchange Online, and Outlook.com accounts, your Archive folder already exists, even if you've never used the feature before.You'll find it in your Outlook folder list. If you don't see the folder and you're using Outlook 2016 or Outlook for Microsoft 365, go to File > Office Account > Update Options > Update Now.

Learn how to use OneDrive Files On-Demand to sync your OneDrive files and save disk space in Windows 10.

How to use the SUM function in Excel to add individual values, cell references, ranges, or a mix of all three.

How to use the INDEX function in Excel to return a value or reference to a value within a table or range.

Learn how to use mail merge in Word to create custom documents, envelopes, email, and labels with individualized elements for each recipient.

Need help setting up an Xbox account or signing in to Xbox on your console, PC, or mobile device? This solution will help you sign in or create a new account.

Learn how to use Narrator, a screen-reading app built into Windows, with this complete guide and how-to articles.

Learn to add email accounts such as Gmail and Yahoo! Mail to your Outlook.com app so you can view all of your mail from one location.