I have a network enviroment where my windows 2000 server is just acting as fileserver for sharing, so all the users has an account there with username, password and a list of access rights.

Now i want to keep this server cause i am running from there an application that 20 users access but also i want to add a new Windows 2008 R2 64 bit server as a domain controller. Is this possible ?

1-It is ok to make the new windows 2008 server a domain controller ?

2- I want all the users accounts to be the same in the domain controller so they can still use the same username and password to login into the domain as well into the windows 2000 server that is setup as a Workgroup.

3- Do i need to do something to the windows 2000 sever to still be functional in the environment so it can be accessed by the clients computers?

note:My clients computers are windows 2000 pro, xp pro and windows 7 32/64 bit. Thanks in advance