What features does the “MailChimp Integration” extension have?

[lukasz412]

Is it possible to automatically create groups of recipients for the "Client", e.g. if “field A” is not empty then the email address is...

[lukasz412]

What possibilities does the “MailChimp Integration” extension provide?
Will I be able to easily add selected Customers to previously prepared...

[lukasz412]

Thanks for the information

[lukasz412]

If I purchase the add-on “1 Year License + Upgrades” will it work after one year? Is an upgrade necessary for the add-on to work?