To fix the Unknown error trying to lock file in Teams, Excel, OneDrive, PowerPoint, SharePoint, etc, Office apps use these proven solutions.

Microsoft Excel lets you embed content from other applications, including PDF files. You can embed a PDF file into a cell of an Excel worksheet and then use Excel's security features to lock the ...

We show you how to protect a worksheet in Excel, as well as how to lock specific cells and formulas in Excel from editing or formatting.

Sending Excel files containing crucial financial and business data has risks. To add a layer of protection, you should learn to password protect an Excel file.

How to Have Excel Freeze Row and Column Data It's often useful to freeze header rows or columns in Excel while navigating through a spreadsheet.