Thunderbird is most likely the greatest competitor from the famous Outlook Express e-mail client application. However, the greatest benefit of Thunderbird is this fact application is totally free, unlike the Microsoft product. Thunderbird is extremely effective and functional, recption menus is obvious and transparent, and furthermore we are able to personalize it, because the latest version provides a couple of skins which we are able to use to alter its layout, because of what we should could make this Mozilla product fitting to the preferences. The most recent version of Thunderbird is a superb e-mail client application, browser, along with a manager of debate groups. It's very interesting to see that Thunderbird enables us to spread out several e-mails at the same time in separate tabs, as with a internet browser. Because of that people can observe several mails at the same time and that we don't have to move together. It's worth to see, that Thunderbird may be the quickest e-mail client application, if this involves both startup and hooking up with e-mail servers. Thunderbird, just like a number of other programs of the kind, offers us a filter which blocks undesirable mails, therefore we can also add customers towards the black list and they'll be blocked when they ever send us any message. Furthermore, Thunderbird offers its customers a spelling dictionary. Finally, this application perfectly combines with a myriad of browsers, os's, also it offers us amazing options. Furthermore, we are able to install some plug-inches which will raise the functionality of Thunderbird.