Sharing workbooks in MS Excel can improve collaboration among team members. But sometimes, the “Unshare Workbook” option may be greyed out, leaving you unable to revert your workbook to a private document. In such a situation, it is important to solve this problem ASAP. In this blog, I will explore why is the unshare workbook greyed out in Excel and how to troubleshoot it to regain control of your shared Excel files.