I want recover and convert .imm files (email in Incredimail) to Thunderbird files (Sqlite) or other format (possibly .dbx). Is it possible?
No, the application won't convert IMM to Thunderbird. The software pretends to have support for all file types, but in fact, it changes the file extension and that's it. You need a special converter to change IMM files to another format. For this purpose you may try IncrediMail Converter.