Find out which power supply model goes with your Surface device—including the power supply model number, power and wattage, and USB charging port.

Internet Explorer 11 support ended on June 15, 2022. We recommend you use Microsoft Edge for a faster, more secure and more modern web browsing experience.

Microsoft Authenticator is a free app that helps you sign in to all your accounts without using a password - just use a fingerprint, face recognition, or a PIN.

Sharing OneDrive files, SharePoint files, or Lists with other people allows you to securely collaborate with people outside your organization.

Create a simple formula to multiply and divide in an Excel spreadsheet. You can multiply two or more numbers in one cell or multiply and divide numbers using cell references. All formulas in Excel begin with an equal sign (=).

Change the default font for email messages that you send, or use a different font for messages that you forward or reply to.

When you enter a recipient's name in the Bcc (blind carbon copy) field of an email, that recipient receives a copy of the email without their name being visible to the other recipients.

Learn how to use the PC Health Check app to help you improve your device performance.

When you create a presentation and then save it as a PowerPoint template (.potx) file, you can share it with your colleagues and reuse it again.

Learn how to use the Activation troubleshooter to resolve common activation issues in Windows.