I create a new account user2 on the same computer and try to backup the OST file. BE skips the file. check permission in windows explorer does not show any right/permission different. but use CACLS shows a little bit different but I don't understand why it skips the OST file for user2
Z:\>cacls users1
Z:\users1 NT AUTHORITY\SYSTEM:(OI)(CI)F
BUILTIN\Administrators:(OI)(CI)F
CCS\users1:(OI)(CI)F
Z:\>cacls users1\AppData
Z:\users1\AppData NT AUTHORITY\SYSTEM:(OI)(CI)(ID)F
BUILTIN\Administrators:(OI)(CI)(ID)F
CCS\users1:(OI)(CI)(ID)F
Z:\>cacls "users1\AppData\Local\Microsoft\Outlook\outlook.ost"
Z:\users1\AppData\Local\Microsoft\Outlook\outlook.ost NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Administrators:(ID)F
CCS\users1:(ID)F
Z:\>cacls users2
Z:\users2 NT AUTHORITY\SYSTEM:(OI)(CI)F
BUILTIN\Administrators:(OI)(CI)F
CCS\users2:(OI)(CI)F
Z:\>cacls users2\AppData
Z:\users2\AppData NT AUTHORITY\SYSTEM:(OI)(CI)F
BUILTIN\Administrators:(OI)(CI)F
CCS\users2:(OI)(CI)F
Z:\>cacls users2\AppData\Local\Microsoft\Outlook\outlook.ost
Z:\users2\AppData\Local\Microsoft\Outlook\outlook.ost NT AUTHORITY\SYSTEM:F
BUILTIN\Administrators:F
CCS\users2:F