Email messages are an important part of every business, even personal communication. Email messages are used (sent/received) between two or more users in remote locations. We've all heard of email, so let's explain a little how email messages are sent and received, and what is an email client application?
Today, the two most popular applications for sending/receiving email messages are by far: MS Outlook and Mozilla Thunderbird.
The first application (Microsoft Outlook) is commercial and is purchased with an MS Office license. This package includes, among others, Outlook. As an integral part of the Office suite, we already see how important it is to have an email client application for office business. MS Outlook is a frequently used application, mostly because it comes together with other office tools (MS Word, MS Excel, MS Powerpoint...).
Unlike the MS Outlook application, Mozilla Thunderbird is a free version of the tool for receiving/sending email messages, which does not lag behind its commercial competitor. Both applications are business, with capabilities that are needed in this segment of office business.