We have changed our webhosting provider, so we want to move our emails from our old provider's mailboxes to the new mailboxes. However, neither drag-and-drop, nor right clicking and selecting the "Move to" options work (I do it, but the emails don't move). I even tried moving to a Local directory, but that works only once out of 10 tries. I am very confused and would be incredibly grateful if someone has any advice.