If you want to find people in your organization, but are getting confused with all the different user names and email addresses, you might be interested in the Salesforce User Search.

This Salesforce extension enables you to search for users using their username, email address, full name, or the ID that they use in Salesforce.

If you are a manager, or if you are thinking about becoming one, this is a tool that can help you find your way around the organization better.

This user search can search for all users and it can also filter the results by their email address or username.