I'm using a hotmail account in Windows Live Mail 2012 and as well as having many folders on the same level as the inbox many of these have their own sub-folders and, indeed, some of those have sub-folders of their own.
This works find in Outlook 2003, 2007, 2010 and (when it works at all) in 2013.
It works fine on the web page.
It works fine on the iPhone and iPad
It mostly works fine in Windows Live Mail BUT just occasionally I find that all of the sub folders simply vanish (together with their contents) and then I have to delete the account and set it up again. Fortunately everything reappears and syncs again as if nothing had happened. Closing the program and restarting doesn't solve it. Restarting the computer doesn't solve it. Only removing and then adding the account back solves it - until the next time.
I have the program running on two Windows 8 (64bit) machines and they both did the magic vanishing trick within seconds of each other yesterday.
On both computers I have had to remove and then add the account to work again.
Anyone like to offer a reason or better still, a solution?