21.1. Your Excel Identity
Excel knows more about you than you might think. Behind the scenes, all Microsoft's Office applications store some basic information about you, including your first and last name . This information is usually set when you (or whoever) first installed Office.
For most tasks , it doesn't matter who Excel thinks you are. But making sure you have the right identity becomes much more important when you need to collaborate with other people. For example, if you're adding comments regarding someone else's work, you want to make sure they know that it's Tim Smith making the suggestions (and not "Excel User 1" or "SalesComputer012").
The best idea is to make sure that Excel has the correct name stored for you before you start to use comments and change tracking. To see the name Excel is using, select Tools Options. When the Options dialog box appears, select the General tab. The name Excel uses is in the "User name" text box in this tab. If you want, you can edit the name, and then click OK to apply your change.
Once you change your name, Excel will use it every time you create a new workbook. However, Excel won't change the workbooks you've already created or reviewed.