World has been referred to as a Global Village because of the communication. Effective communication has provided a medium for the business to grow and expand worldwide by interacting with different people and communities, and by sharing their ideas in every part of the world. Emails are considered the most reliable and official way of communication between the business and corporate sectors. Although web-based email clients are available, most widely used, and easily accessible through your browsers but when you talk about generic users and corporate usage, then one would notice an incline towards the native email clients. Outlook being the most popular for this particular reason, does not offer a free version that can not be very economical for the growing business. There are plenty of other options though, that are free and open source. We have enlisted top 7 free and open-source options for you to analyze your..