From Thunderbird to MailBird 2.0?

Question

Computer networks

Good afternoon,
I actually stumbled upon a new (for myself) mailer (Mailbird), I have been sitting on thunderbird for a very long time, there is someone who crawled from thunderbird to MailBird and what are the feelings?

Answer 1

I chose Postbox (the same Thunderbird only in profile)

Answer 2

I understand that he can only work with one account? which is not cool, also Thunderbird is an open source project, which can not be said about MailBird. Yes, and recently calendars and synchronization with Google calendar have been added to Thunderbird, which is convenient.