When your old email address or phone number doesn't suit you anymore—but you want to retain your contacts, online storage, subscriptions, and settings—you can add a new email address or phone number as an alias to your existing Microsoft account.

About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.

The CELL function returns information about the formatting, location, or contents of a cell. For example, if you want to verify that a cell contains a numeric value instead of text before you perform a calculation on it, you can use the following formula:

Learn about different things you can try to fix network connection problems in Windows.

Learn how to record Teams meeting. Capture audio, video, screen sharing activity, and troubleshoot recordings in Microsoft Teams.

See how to find things you've downloaded on your PC.

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Get a brief explanation about logging on as an administrator and making changes to other user accounts on your computer.

Keys with an Fn key or F Lock provide two sets of commands for many keys. This includes the top row of standard function keys (F1–F12). Standard commands are labeled on the front of the keys (such as F3).

Learn how to use virus and threat protection options in Windows Security to scan your device for threats and view the results.