have these:

Windows 2000 Windows 2003
32 bit OS 32 bit as well as 34 bit
supports FAT, FAT32 and NTFS FAT,FAT32, NTFS and EFS
partial plug and play fully plug and play
medium scale network support Large scale
Medium hardware support full hardware support
Active Dir 1.0 Active Dir 1.1
uses ntds.dit( 16MB Size) uses ntds.dit( 12 MB Size)
Cross Forest trust cannot be Estd can be estd
No Application partition has application partition
Group Policies are implemented Same
DHCP authorization is slow faster dhcp authorization
DNS is used to integrate with domain dns integration with domain
NTFS ver 3.0 ntfs ver 3.1
NTLM and kerberos authentication kerberos authentication