If you would like to enable Shared Workbook option, here's a way to add it to Excel Quick Access Toolbar. It is hidden under Excel Options.

The workbook is the file that contains all of the elements of your Excel spreadsheet. Don't confuse a workbook with a worksheet in Excel-the worksheet is an element of a workbook.

Check if the Excel workbook file is shared among different users and if it is a possibility that another user may be accessing it at the same time. Wait for the other user to close the file.

Combining Changes in Excel. When multiple employees work on different copies of an Excel workbook, you eventually need to combine the changes to produce a single file. Excel's Compare and Merge ...