Modify UPN using "E-Mail" field on general tab

Aug 17, 2014 at 7:27 PM
Need to use the email field on the general tab to modify the UPN. Issues is I am not sure how to just pull the first.last and leave off the The names in AD cannot be used as they have spaces and special characters. The email field minus the has the exact info needed.
Anyone know how to achieve this?