Customer notice that many of 'unknown account' stay on C:\ProgramData\Microsoft\Windows\Start Menu folder and inherited to the subdirectories. As I see, there are shortcuts in the subfolders.

Many of machines contains hundreds of accounts, and some DAU users. If we deleted that unknown accounts, after a restart we saw that the DAU users moved to unknown accounts. I saw a machine with 2000 'unknown accounts'.

Why this folder need for DAU user?
What does DAU user do and why stay more and more user on this folder?

Is somebody experience this issue?