Saw this today…. “Error while aging folder “Inbox” in store “Personal Folders”. File access is
denied. You do not have the permission required to access the file
C:\WINDOWS\Application Data\Microsoft\Outlook\archive.pst.”
It was on an older Outlook 98/Windows 98 system, but it was something that might be applicable to others as well.
Basically, this system has two different profiles, both of which are password protected.