Currently in Evolution 2.22.3.1, the Tasks, Memos, Contacts, and Calendars appear as a flat list if you have multiple instances of these. This is particularly the noticabe if you are migrating from Outlook (which has had this capacity since at least the office 2000 version). For example, I had a folder of work tasks, then under those tasks I had a folder for tasks relating to a number of products I maintain, then under those tasks I had a folder for future or possible features + a folder for changes / changelog + a folder for bugs. (I.e. at least 3 levels of nested task folders). Other examples: Under my tasks I had a folder for Personal tasks, under that folder I had a folder for individual tasks relating to big projects (e.g. Renovating the Kitchen, and all the individual little bits that need to be done for this). Same for contacts: Personal contacts, then under this folders for Personal contacts relating to the particular areas that I know those people from. Similar idea for notes. I'm sure people could also use this for Calendars (although I personally did not). Converting this data to Evolution though has forced me to collapse this hierarchy for these things into one big flat list, and it once you're used to a hierarchy, a flat list really jars and feels less powerful. The only thing Evolution seems to support hierarchies for is email (folders that can contain folders). Can we please consider adding the same functionality for tasks, memos, contacts, and maybe calendars?