1) Doamin rename is not possible in windows 2000
2) windows 2k - IIS 5 and windows 2k3 - II6
3) Windows 2k - IE 5 and Windows 2k3 - IE6
4) Terminal service are enhanced in win2k3
5) Windows 2k doesn't have 64 bit version

1. DNS Stub zone has introduced.

2. Shadow copying has introduced.

3. Schema version has changed from ver.13 to ver.30.

1) Doamin rename is not possible in windows 2000
2) windows 2k - IIS 5 and windows 2k3 - II6
3) Windows 2k - IE 5 and Windows 2k3 - IE6
4) Terminal service are enhanced in win2k3
5) Windows 2k doesn't have 64 bit version
6) DNS Stub zone has introduced in win2k3.
7) Shadow copying has introduced.
8) Schema version has changed from ver.13 to ver.30.

1)	When installing terminal services for win2000 u r 
prompted to select application server functions or 
administrative functions sets can be installed sequently on 
one server but it performs only one function at one time. 
But in 2003 still distinguishes between application and 
administrative services but installation and management are 
now consolidated.

2)	In Win 2000 server we can apply 620 group policies 
but in 2003 we can apply nearly 720 so Win2003 server is 
more secure than win 2000 server.
3)	In 2000 we cannot rename domain whereas in 2003 we 
can rename Domain.

4)	In 2000 it supports of 8 processors and 64 GB RAM 
(In 2000 Advance Server) whereas in 2003 supports up to 64 
processors and max of 512GB RAM.

5)	2000 Supports IIS 5.0 and 2003 Supports IIS6.0 

6)	2000 doesn’t support Dot net whereas 2003 Supports 
Microsoft .NET 2.0 

7)	2000 has Server and Advance Server editions whereas 
2003 has Standard, Enterprise, Datacenter and Web server 
Editions. 

8)	2000 doesn’t have any 64 bit server operating 
system whereas 2003 has 64 bit server operating systems 
(Windows Server 2003 X64 Std and Enterprise Edition) 

9)	2000 has basic concept of DFS (Distributed File 
systems) with defined roots whereas 2003 has Enhanced DFS 
support with multiple roots. 

10)	In 2000 there is complexality in administering 
Complex networks whereas 2003 is easy administration in all 
& Complex networks.

11)	In 2000 we can create 1 million users and in 2003 
we can create 1 billion users. 

12)	In 2003 we have concept of Volume shadow copy 
service which is used to create hard disk snap shot which 
is used in Disaster recovery and 2000 doesn’t have this 
service. 

13)	In 2000 we don’t have end user policy management, 
whereas in 2003 we have a End user policy management which 
is done in GPMC (Group policy management console). 

14)	In 2000 we have cross domain trust relation ship 
and 2003 we have Cross forest trust relationship. 

15)	2000 Supports 4-node clustering and 2003 supports 8-
node clustering. 

16)	2003 has High HCL Support (Hardware Compatibility 
List) issued by Microsoft.





17)	Code name of 2000 is Win NT 5.0 and Code name of 
2003 is Win NT 5.1

18)	2003 has service called ADFS (Active Directory 
Federation Services) which is used to communicate between 
branches with safe authentication. 

19)	In 2003 their is improved storage management using 
service File Server Resource Manager (FSRM).

20)	2003 has service called Windows Share point 
Services (It is an integrated portfolio of collaboration 
and communication services designed to connect people, 
information, processes, and systems both within and beyond 
the organizational firewall). 

21)	2003 has Improved Print management compared to 2000 
server.

22)	2003 has telnet sessions available.

23)	2000 supports IPV4 whereas 2003 supports IPV4 and 
IPV6.

in windows 2000 server client vession also available 
eg:windows 200o professional but in windows server 2003 
client version is not available

2003AD:-
1.2 Million object can be created .
2. It is a new feature available in 2003.
3.Between  parent and child, there is  built in trust .It 
is called as transitive trust.
4. Same partitions are there in 2003, but one additional 
partition called Application directory partition is present.
5. but in 2003 we can apply nearly 720 so Win2003 server is 
more secure than win 2000 server.
6. Automated System Recovery(ASR) is there

-2000AD:--
1.Only one million object can be created.
2.Universal group membership is not present.
3. Between parent and child, there is no built in trust .It 
is called as non-transitive trust.
4. There is only three AD partition, Domain partition, 
configuration partition, schema partition.
5. In Win 2000 server we can apply 620 group policies .
6. but 2k only Emergency Repair   Disk(ERD) is there.

Hi everyone Mentioned the Answers correctly.
But Here the major differance that you need to answer.

In windows 2003 server, AD partion is 5 where as in 2k that 
is 3 
The added partion is: 1) Global catelog 2) Application 
partion.

In 2k the Domain operation Roles and only two mode of 
operation and in Win2k3 there are 4 modes of Domain 
operation [Native mode, Mixed mode , Itrative mode and 
windows 2003 mode .

"Windows 2000" is also called as "Win2k" . It is an 
interruptible, business oriented and graphical operating 
system which was just designed to work along with 
the "uniprocessor" or "symmetric multi processor 32 bit 
Intel x86 computers". It is a part of the "Microsoft 
Windows NT" series of operating systems. It was succeeded 
by "windows XP" in "windows server 2003". The "Windows 2000 
Server" has extra and additional functionality which 
includes the ability to provide the "Active Directory 
services". Active directory services is a hierarchical 
framework of resources. Windows 2000 server also proved 
Distributed File System (it is a file system which supports 
file sharing) and storage volumes for fault 
redundancy. "Windows Server 2000" supports upto four 
processors, up to four GB of RAM. "Windows 2000 server" is 
designed to use for web applications, file servers, print 
servers etc. 
Windows 2003 server is a "server operating system". It is 
created by Microsoft. It is also called as successor 
of "Windows 2003 server". It's performance is much better 
than the "Win2k". it can be used as "centralized management 
tool" for the printers and files. It gives "enhanced quota 
management". "Windows 2003 server" also 
includes "compatibility modes" to allow the older 
applications to run and execute with larger stability.
You can have a look at 
http://wiki.answers.com/Q/What_is_difference_between_windows
_2000_server_and_windows_2003_server
However,in order to optimize its function, I think you 
should partition your disks 
sometimes.http://www.softpedia.com/reviews/windows/EASEUS-
Partition-Manager-Server--Review-92249.shtml

In 2k3 there is stub zone but in 2k it is not there.
cross trust & shortcut trust are available only in 
2k3.group replication problem was there in 2k but it is 
removed from 2k3.
In 2k you have to create trust between parent & child but 
in 2k3 the trust between parent & child is automatically 

created when you create parent & it's child.
you can't change the domain name in 2k but in 2k3 we can 
change domain name.

In w3k server inbulid firewall is there.

2k is NT 5.0 
2003 is NT5.2 
2k supports 16 milion users only 
2k3 supports 1 bilion users
windows 2k - IIS 5 and windows 2k3 - II6
windows 2k - database size is 16mb
and windows 2k3 - database size is 12mb
there is a extra features in 2k3 
1}VSS
2}domain renaming 
3}cross forest trust
4}stub zones
in 2k3 AD partion is 5 but 2k AD partion is 3

1. In win 2000 server there is only 10 users can access the 
shared folder at the same time, but in windows 2003 server 
we can access N number of users at the same time.

2. We can rename a domain in windows 2003 server whereas in 
windows 2000 we can not rename the domain

3. Shadow copies is the new feature available in windows 
2003, in 2000 we don't have this option

4. 2000 server and advanced 2000 server only available 
whereas in 2003 server there are four version are available.
5. IIS 5.0 In 2000 server, IN 2003 server IIS 6.0

6. IE5 2000 in server and IE6 in 2003 server