Add a password to protect your entire workbook and control whether others can open or make changes to it. Protect your file by setting passwords for Open and Modify.

Learn how to use encryption and other security settings to protect messages sent from Outlook.

Open the sheet or workbook that you want to protect. On the Review tab, click Protect Sheet or Protect Workbook. In the Password box, type a password, and in the Verify box, type the …

To prevent other users from accidentally or deliberately changing, moving, or deleting data in a worksheet, you can lock the cells on your Excel worksheet and then protect the sheet with a …

To password protect a Word document, use Open in Word to open it in the desktop version of Word. Thereafter, you must use the Word desktop program to open and edit the document.

When you start up Windows 10 for the first time, Windows Security is on and actively helping to protect your PC by scanning for malware (malicious software), viruses, and security threats. …

Real-time protection is a feature in the Windows Security app that continuously monitors your device for potential threats such as viruses, malware, and spyware. This feature ensures that …

Learn how to protect your Windows devices and personal data from viruses, malware, or malicious attacks.

Microsoft Defender is the simple way to protect your digital life and all of your devices. It's included as part of your Microsoft 365 Family, or Personal, subscription at no extra cost.

Excel gives you the ability to protect your work, whether it’s to prevent someone from opening a workbook without a password, granting Read-Only access to a workbook, or even just …

The Windows Security app is a comprehensive security solution integrated into Windows, designed to protect your device and data from various threats.