If you don’t belive me just read this link:http://www.windowsphone.com/en-us/how-to/wp8/email-and-calendar/set-up-or-delete-an-email-account
To factory reset your phone go to :Settings/System/About and select ” Reset your phone”
-You do this at your own risk! Make sure your phone battery is fully charged!
-Take your sim card and memory card from the phone before the reset!
-Read carefully the annotations provided in this video tutorial!
-All data will be erased from your Microsoft Lumia 550!