I am currently using Windows Live Mail 2012 (Build 16.4.3528.0331) with my outlook.com account on a computer running Windows 7 64-bit and have structured my email storage in a folder/subfolder tree with several levels of subfolders.  I am currently having a problem with subfolders at the second level which, on increasingly frequent occasions, do not show up.  I can recover them by removing and then adding the outlook.com account again but this is not a fix for the problem; it simply allows me to continue working.  My wife also has an outlook.com account on a different Windows 7 64-bit computer and is also having the same problem.

Can anyone help with a permanent fix, please?