Simplify the following text for a Grade 6 native English-speaking person.
Original: The only elements of the Windows project which were included in Windows 2000 were the ability to upgrade from Windows 95 or Windows 98 , and support for the FAT32 file system .
Simplified: Systems Management Server can be used to upgrade multiple computers to Windows 2000 . These must be running Windows NT 3.51 , Windows NT 4.0 , Windows 98 or Windows 95 OSR2 .