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ANSWER: You will need to have a Google™ (i.e., gmail) or Microsoft (i.e., Hotmail, Outlook, Live, MSDN, etc.) based email. If you are unsure of what type of email account you have, try registering with both the Google and Microsoft options. You can also create a FREE Esri ArcGIS Public Account.
Since we may use the email address to contact you for recognition and feedback purposes, please use an email address that you will check periodically and add nationalmapcorps@usgs.gov to your contact list to ensure our messages get through to you.
Disclaimer: Any use of trade, firm, or product names is for descriptive purposes only and does not imply promotion or endorsement by the U.S. Government.