This document summarizes the results of a survey about email usage among knowledge workers in various countries. Some key findings include: - People in most countries spend 3+ hours per day checking work email and 1-2 hours on personal email, except in Japan which is lower. Indians spend the most time on work email. - While most emails are opened, only around half are considered useful, especially in Japan, France and the UK. - Most people check personal email or social media before work, though some resist checking work email until they arrive. - About half of workers achieve an empty inbox ("inbox zero") on any given day, though in India most see this as an achievement. - Only