I have upgraded to win 10 from win 7 and windows live mail no longer displays sub folders.

 The main folders i.e Inbox deleted, my folders also display ie. Holidays but the folders below this folder have disappeared. I can find the emails in the disappeared folders by using search, if I try and create a new folder in Holidays the new folder shows as a sub folder. If I try and create a folder in Holidays using the name of a folder that does not appear live mail tells me the folder already exist.

I have accessed my account on hotmail/Outlook via the internet and the sub folders are there !!!!!