Yahoo has given its email service a major makeover, both for its desktop and mobile products. The changes include a streamlined and less cluttered interface that is easier to navigate. The new version of Yahoo! Mail is also faster for users to open and read messages. The changes have been long in coming, and probably arrived just in time for Yahoo if it wants to remain a viable email provider for the masses, said Paul Levinson, professor of communication and media studies at Fordham University.