It is no surprise that mobile usage has significantly jumped over the past year. In fact, according to a recent study by Litmus Email Analytics, mobile email opens have increased by 138 percent within the last 18 months, and each month those numbers continue the rise. However, the study also shows that while mobile opens have surpassed desktop with the iPhone holding 23 percent of the email market share. Outlook still follows with a crucial 16 percent. The statistics clearly....