Homer and Marge form a California corporation to start a business to provide computer consulting services, web design and software development. Their business name is Vircon. Six months later, Homer discovers a small company in the real estate construction business named "Vircom", located and doing business only in Arizona, providing consulting services and estimates of costs for real estate construction projects. Homer and Marge never registered the Vircon trademark with the U.S. Patents and Trademark Office or with the California Secretary of State's Office. After doing a little research, Homer determines that Vircom registered its trademark in Arizona and federally before Vircon began using its trademark in interstate commerce.

Discuss whether Vircom has infringed on Vircon's trademark?