Thunderbird Or Outlook? Advantages And Disadvantages Of The Two
Interface
The interface of the Microsoft product is rather bloated with a multitude of buttons/shortcuts to a set of features that most users would likely access rather rarely (power users might appreciate this aspect though). By contrast, the inbox appears rather clutter-free. As for Thunderbird, the most visually disturbing default issue is the small font size of the message box (while the text window can be enlarged, the font size stays the same and it is not particularly obvious how to change it).
Searching

Thunderbird has
Interface
MS Outlook is one of the series of Outlook products that Microsoft kept offering for free as part of its Windows releases. The initial version had enough bugs and issues, which determined many users to become loyal to other desktop email clients, such as Thunderbird, The Bat, etc. All these provided an interesting diversity and unique solutions to the same problems. The situation seems to have changed nowadays when Outlook has become a much more refined product with an incredibly large user base (approximately 400 million people).