Is Mailbird based on Thunderbird?

[tanstaafl]

http://www.ghacks.net/2017/01/16/ghacks ... me-55-off/ claims MailBird is based on Thunderbird. The web site doesn't say, though it makes a point of claiming its the best alternative to Thunderbird. I can see a lot of similarities between the two but it doesn't even have a prefs.js file, which even Postbox kept when they changed the user interface.

Can anybody confirm that it is based on Thunderbird?

[Grumpus]

Mailbird Maybe a little more information.

[morat]

AFAIK, Mailbird is based on Sparrow, developed on the .NET Framework.

Google search for Sparrow on Mailbird site
http://www.google.com/search?q=Sparrow+ ... ilbird.com

Mailbird API Documentation
http://www.getmailbird.com/api/html/ca8 ... 9e273f.htm

[tanstaafl]

I added a comment asking how he determined that it was based on Thunderbird since it doesn't appear to use the Mozilla toolkit and the web site doesn't document that some code was covered by a Mozilla license. He said he made a mistake.