If it's a windows-based server, there's probably little need to do much text editing, so installing Notepad++ wouldn't be needed or desired. Then, you suddenly need to copy/paste/amend some text, so you end up opening Notepad. My use of it is typically if I'm connecting remotely to the Windows desktop and am not sure if the keymap is correct when typing in a password, so I type it into Notepad to make sure I'm putting in what I think I'm typing.