Need to rename your Microsoft Outlook 2010 profile name? Here’s how to rename an Outlook 2010 profile name:
Option one: Go to the Control Panel, launch the Mail applet and copy the profile you want to rename then make the name of the new profile the same as the name you want to rename it to. Next delete the old profile
The DefaultProfile registry key holds the name of your Outlook profile. Right click the DefaultProfile registry key and rename it to whatever you want to rename your Outlook 2010 profile to then rename the actual profile stored under this key in the same way. (That’s two registry key renames to rename your Outlook profile name)