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Go to File > Info > Protect Document > Encrypt with Password. Type a password, press OK , type it again and press OK to confirm it. Save the file to make sure the password takes effect.
You can add a password to an Excel file to prevent unauthorized users from opening or modifying it.
How to protect an Excel file using a password to prevent unwanted access to your data.
To open a password-protected presentation: Enter the password for the file in the box. Passwords are case-sensitive. Make sure you don't accidentally have Caps Lock turned on. You can try again if you enter an incorrect password. The file can't be opened without the password.
Protect your most important files in OneDrive Personal Vault with an extra layer of security. Learn how to set up, lock, or unlock Personal Vault.
To add a new password, click Protect Sheet or Protect Workbook, type and confirm the new password, and then click OK. To remove a password from the workbook, click Protect Workbook , and then click OK without entering a new password.
You can help keep your private notes safe from prying eyes by protecting a OneNote notebook section with a password. When a section is password-protected, all of its pages are locked until you enter the correct password.
Password-protect project files to make them read-only or prevent others from opening them at all. You can set a password when you save the file.
A password can be set for an Outlook Data File (.pst) to help prevent unintentional intrusion by other people who share your computer. When a password is used, a password prompt appears when Outlook starts or when the file is first opened within an Outlook session.
This article explains how to encrypt a database by using a database password, and how to decrypt a database and remove its password. In earlier versions of Access, you could create user accounts and passwords using a feature named user-level security.