Change the default name for new comments in Excel 2007

By default the user name that is specified for Excel 2007 appears when you create a new comment. To change this name, you have to change the user name for Excel 2007. Perform the following steps to do so:
1. Open Microsoft Excel.
2. Click the Microsoft Office Button and click Excel Options.
3. From the Excel Options dialog box, from the left pane click Popular (by default this tab is selected, if is not selected then click to select it).
4. From the right pane, under Personalize your copy of Microsoft Office, enter a name in the User name: box.
5. Click OK.

Now when you add a new comment, the name that you entered in the User name: box will appear as the default name for the new comments.