system
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I have let Thunderbird (yes, sorry for the mix up) connect directly without Avast AV proxy to internet and it created folders.
After that I set it up to go through 127.0.0.1:143 using name#server.si
I have also updated Avast to lattest version.
The moving/creating/deleting of files in folders now works. Also creating folders now works.
Perhaps the glitch was that mapi server expects folders to be subfolders of inbox and not directly of account.
If you’d like to test creating account, the name of service is www.email.si
They offer 10MB of mailspace free with pop3, imap, smtp and web access.
The site is in Slovenian, although the pages to manipulate mail are available in English. But I guess, since you’re Czechs, you should be able to figure it out. If not I can translate the signup page. Just click on “Registracija” (Registration) from front page, it should be obvious from there.
The cube icon with “Nastavitve” in inbox should take you to settings, where you can choose language “Jezik”.