Esta questão é discutida em detalhes aqui .
Aqui está um trecho -
some of the Windows Live Essentials components are creating these folders. So far, it was confirmed that both WL Mail and WL Messenger could create them, but there may be other WL apps that do the same thing (again, as noted above.) Apparently, WL Mail (or other WL apps) create these folders whenever the program has not been run in a while. This generally results in one folder per day, but if enough time passes without the WL app being run (perhaps 12 or more hours), more than one of these folders can be created on the same day.