New domain controller/directory server on Linux?
I'm currently investigating setting up a new Domain Controller or Directory Server on Linux to replace an single aging NT Domain controller supporting about 30 local workstations. I was wondering if anybody had any experience in doing this as I've only previously used Active Directory as this is the de facto thing.
migrate all the existing users from one NT domain controller (preferably to new box)
Single sign-on for both Windows and Linux machines
This seems to be quite hard to do, so any help is appreciated.