How to Unshare a Workbook in Excel 2007

1. Open the workbook you would like to unshare in Microsoft Excel 2007.
2. Go to the 'Review' tab and go to the 'Changes' section.
3. Click on 'Share Workbook' and go to the 'Editing' tab.
4. Uncheck the 'Allow changes by more than one user at the same time. This also allows workbook merging' box. Click OK.