It would be great to be able to format text in the Task comment. As it is possible to insert an attachment, comment formating is something I need daily. How is it possible to insert formated text from emails and am not able to write and format comment by myself from scratch?
This is dependent on what your server supports.
If you create a Task in Local Folders, you have full formatting available in the notes field, including font sizes, colors etc. and embedded images. But if you create a Task in say your Google Calendar, then formatting is not supported.